ARM: rockchip: Add rv1108-elgin-r1 board support

Add the initial support for Elgin R1 board, which is based on the
RV1108 SoC and has the following features currently supported in
U-Boot:

- UART
- eMMC
- USB

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

configs/elgin-rv1108_defconfig

@@ -0,0 +1,58 @@
+CONFIG_ARM=y
+CONFIG_ARCH_ROCKCHIP=y
+CONFIG_SYS_TEXT_BASE=0x60000000
+CONFIG_ROCKCHIP_RV1108=y
+CONFIG_TARGET_ELGIN_RV1108=y
+CONFIG_DEBUG_UART_BASE=0x10210000
+CONFIG_DEBUG_UART_CLOCK=24000000
+CONFIG_DEBUG_UART=y
+CONFIG_NR_DRAM_BANKS=1
+# CONFIG_USE_BOOTCOMMAND is not set
+CONFIG_DEFAULT_FDT_FILE="rv1108-elgin-r1.dtb"
+# CONFIG_DISPLAY_CPUINFO is not set
+CONFIG_DISPLAY_BOARDINFO_LATE=y
+CONFIG_CMD_GPIO=y
+CONFIG_RANDOM_UUID=y
+CONFIG_CMD_MMC=y
+CONFIG_CMD_USB=y
+CONFIG_CMD_USB_MASS_STORAGE=y
+# CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_CACHE=y
+CONFIG_CMD_TIME=y
+CONFIG_DEFAULT_DEVICE_TREE="rv1108-elgin-r1"
+CONFIG_ENV_IS_IN_MMC=y
+CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_REGMAP=y
+CONFIG_SYSCON=y
+CONFIG_CLK=y
+CONFIG_FASTBOOT_BUF_ADDR=0x62000000
+CONFIG_FASTBOOT_BUF_SIZE=0x08000000
+CONFIG_FASTBOOT_FLASH=y
+CONFIG_FASTBOOT_FLASH_MMC_DEV=0
+CONFIG_ROCKCHIP_GPIO=y
+CONFIG_SYS_I2C_ROCKCHIP=y
+CONFIG_MMC_DW=y
+CONFIG_MMC_DW_ROCKCHIP=y
+CONFIG_DM_ETH=y
+CONFIG_ETH_DESIGNWARE=y
+CONFIG_GMAC_ROCKCHIP=y
+CONFIG_PINCTRL=y
+CONFIG_PINCTRL_ROCKCHIP_RV1108=y
+CONFIG_DM_REGULATOR_FIXED=y
+CONFIG_BAUDRATE=1500000
+# CONFIG_SPL_SERIAL_PRESENT is not set
+CONFIG_DEBUG_UART_SHIFT=2
+CONFIG_SYSRESET=y
+CONFIG_USB=y
+CONFIG_USB_EHCI_HCD=y
+CONFIG_USB_EHCI_GENERIC=y
+CONFIG_USB_OHCI_HCD=y
+CONFIG_USB_OHCI_GENERIC=y
+CONFIG_USB_DWC2=y
+CONFIG_USB_STORAGE=y
+CONFIG_USB_GADGET=y
+CONFIG_USB_GADGET_MANUFACTURER="Rockchip"
+CONFIG_USB_GADGET_VENDOR_NUM=0x2207
+CONFIG_USB_GADGET_PRODUCT_NUM=0x110a
+CONFIG_USB_GADGET_DWC2_OTG=y
+CONFIG_ERRNO_STR=y