imx: Add support for Ronetix's iMX7-CM board

Console boot log:

U-Boot SPL 2021.04-00836-ga6232e065d-dirty (Apr 16 2021 - 15:16:35 +0200)
Trying to boot from MMC1

U-Boot 2021.04-00836-ga6232e065d-dirty (Apr 16 2021 - 15:16:35 +0200)

CPU:   Freescale i.MX7D rev1.3 1000 MHz (running at 792 MHz)
CPU:   Commercial temperature grade (0C to 95C) at 44C
Reset cause: POR
Model: Ronetix iMX7-CM Board
Board: iMX7-CM
DRAM:  512 MiB
PMIC:  PFUZE3000 DEV_ID=0x30 REV_ID=0x11
MMC:   FSL_SDHC: 0, FSL_SDHC: 2
Loading Environment from MMC... OK
In:    serial
Out:   serial
Err:   serial
Net:
Warning: ethernet@30be0000 (eth0) using random MAC address - fe:be:37:01:5a:3f
eth0: ethernet@30be0000
Hit any key to stop autoboot:  0

Signed-off-by: Ilko Iliev <iliev@ronetix.at>

configs/imx7_cm_defconfig

@@ -0,0 +1,110 @@
+CONFIG_ARM=y
+CONFIG_ARCH_MX7=y
+CONFIG_SPL_GPIO_SUPPORT=y
+CONFIG_SPL_LIBCOMMON_SUPPORT=y
+CONFIG_SPL_LIBGENERIC_SUPPORT=y
+CONFIG_NR_DRAM_BANKS=1
+CONFIG_ENV_SIZE=0x2000
+CONFIG_ENV_OFFSET=0xC0000
+CONFIG_SYS_I2C_MXC_I2C1=y
+CONFIG_SYS_I2C_MXC_I2C2=y
+CONFIG_SYS_I2C_MXC_I2C3=y
+CONFIG_SYS_I2C_MXC_I2C4=y
+CONFIG_DM_GPIO=y
+CONFIG_TARGET_IMX7_CM=y
+CONFIG_SPL_MMC_SUPPORT=y
+CONFIG_SPL_SERIAL_SUPPORT=y
+CONFIG_SPL=y
+CONFIG_ARMV7_BOOT_SEC_DEFAULT=y
+CONFIG_IMX_RDC=y
+CONFIG_IMX_BOOTAUX=y
+CONFIG_DEFAULT_DEVICE_TREE="imx7-cm"
+CONFIG_DISTRO_DEFAULTS=y
+CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/mach-imx/spl_sd.cfg"
+CONFIG_BOOTCOMMAND="run findfdt; run finduuid; run distro_bootcmd"
+CONFIG_DEFAULT_FDT_FILE="ask"
+# CONFIG_BOARD_EARLY_INIT_F is not set
+CONFIG_SPL_I2C_SUPPORT=y
+CONFIG_SPL_USB_HOST_SUPPORT=y
+CONFIG_SPL_USB_GADGET=y
+CONFIG_SPL_USB_SDP_SUPPORT=y
+# CONFIG_CMD_BOOTD is not set
+CONFIG_CMD_BOOTMENU=y
+# CONFIG_CMD_IMI is not set
+# CONFIG_CMD_XIMG is not set
+CONFIG_CMD_SPL=y
+CONFIG_CMD_SPL_WRITE_SIZE=0x20000
+CONFIG_CMD_MEMTEST=y
+CONFIG_SYS_ALT_MEMTEST=y
+CONFIG_CMD_DFU=y
+CONFIG_CMD_GPIO=y
+CONFIG_CMD_GPT=y
+CONFIG_CMD_I2C=y
+CONFIG_CMD_MMC=y
+CONFIG_CMD_USB=y
+CONFIG_CMD_USB_SDP=y
+CONFIG_CMD_USB_MASS_STORAGE=y
+# CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_BMP=y
+CONFIG_CMD_CACHE=y
+CONFIG_CMD_PMIC=y
+CONFIG_CMD_EXT4_WRITE=y
+CONFIG_OF_CONTROL=y
+CONFIG_ENV_OVERWRITE=y
+CONFIG_SYS_RELOC_GD_ENV_ADDR=y
+CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_BOUNCE_BUFFER=y
+CONFIG_DFU_MMC=y
+CONFIG_USB_FUNCTION_FASTBOOT=y
+CONFIG_FASTBOOT_BUF_ADDR=0x82000000
+CONFIG_FASTBOOT_BUF_SIZE=0x10000000
+CONFIG_FASTBOOT_FLASH=y
+CONFIG_FASTBOOT_FLASH_MMC_DEV=0
+CONFIG_FASTBOOT_CMD_OEM_FORMAT=y
+CONFIG_DM_I2C=y
+CONFIG_SYS_I2C_MXC=y
+CONFIG_DM_MMC=y
+CONFIG_SUPPORT_EMMC_BOOT=y
+CONFIG_FSL_USDHC=y
+CONFIG_MTD=y
+CONFIG_DM_SPI_FLASH=y
+# CONFIG_SPI_FLASH_BAR is not set
+CONFIG_SPI_FLASH_EON=y
+CONFIG_SPI_FLASH_MACRONIX=y
+CONFIG_SPI_FLASH_SPANSION=y
+CONFIG_SPI_FLASH_STMICRO=y
+CONFIG_PHYLIB=y
+CONFIG_PHY_MICREL=y
+CONFIG_PHY_MICREL_KSZ90X1=y
+CONFIG_DM_ETH=y
+CONFIG_DM_MDIO=y
+CONFIG_DM_MDIO_MUX=y
+CONFIG_DM_ETH_PHY=y
+CONFIG_FEC_MXC=y
+CONFIG_RGMII=y
+CONFIG_MII=y
+CONFIG_PINCTRL=y
+CONFIG_PINCTRL_IMX7=y
+CONFIG_DM_PMIC=y
+CONFIG_DM_PMIC_PFUZE100=y
+CONFIG_MXC_UART=y
+CONFIG_SPI=y
+CONFIG_DM_SPI=y
+CONFIG_FSL_QSPI=y
+# CONFIG_FSL_QSPI_AHB_FULL_MAP is not set
+CONFIG_IMX_THERMAL=y
+CONFIG_USB=y
+CONFIG_DM_USB=y
+CONFIG_USB_EHCI_HCD=y
+CONFIG_MXC_USB_OTG_HACTIVE=y
+CONFIG_USB_GADGET=y
+CONFIG_USB_GADGET_MANUFACTURER="FSL"
+CONFIG_USB_GADGET_VENDOR_NUM=0x0525
+CONFIG_USB_GADGET_PRODUCT_NUM=0xa4a5
+CONFIG_CI_UDC=y
+CONFIG_DM_VIDEO=y
+CONFIG_SYS_WHITE_ON_BLACK=y
+CONFIG_SPLASH_SCREEN=y
+CONFIG_SPLASH_SCREEN_ALIGN=y
+CONFIG_VIDEO_BMP_RLE8=y
+CONFIG_BMP_16BPP=y