ARM: uniphier: remove sLD3 SoC support

This SoC is too old.  It is difficult to maintain any longer.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

configs/uniphier_sld3_defconfig

@@ -1,46 +0,0 @@
-CONFIG_ARM=y
-CONFIG_ARCH_UNIPHIER=y
-CONFIG_SYS_TEXT_BASE=0x84000000
-CONFIG_SYS_MALLOC_F_LEN=0x2000
-CONFIG_SPL_MMC_SUPPORT=y
-CONFIG_SPL_SERIAL_SUPPORT=y
-CONFIG_SPL_NAND_SUPPORT=y
-CONFIG_ARCH_UNIPHIER_SLD3=y
-CONFIG_MICRO_SUPPORT_CARD=y
-CONFIG_DEFAULT_DEVICE_TREE="uniphier-sld3-ref"
-# CONFIG_ARCH_FIXUP_FDT_MEMORY is not set
-CONFIG_SPL=y
-CONFIG_SPL_NOR_SUPPORT=y
-CONFIG_HUSH_PARSER=y
-CONFIG_CMD_CONFIG=y
-CONFIG_CMD_BOOTZ=y
-# CONFIG_CMD_XIMG is not set
-# CONFIG_CMD_ENV_EXISTS is not set
-# CONFIG_CMD_FPGA is not set
-CONFIG_CMD_GPIO=y
-CONFIG_CMD_GPT=y
-CONFIG_CMD_I2C=y
-CONFIG_CMD_MMC=y
-CONFIG_CMD_USB=y
-CONFIG_CMD_TFTPPUT=y
-CONFIG_CMD_PING=y
-CONFIG_CMD_CACHE=y
-CONFIG_CMD_TIME=y
-# CONFIG_CMD_MISC is not set
-CONFIG_CMD_FAT=y
-CONFIG_CMD_FS_GENERIC=y
-# CONFIG_SPL_DOS_PARTITION is not set
-# CONFIG_SPL_EFI_PARTITION is not set
-CONFIG_NET_RANDOM_ETHADDR=y
-CONFIG_GPIO_UNIPHIER=y
-CONFIG_MISC=y
-CONFIG_I2C_EEPROM=y
-CONFIG_MMC_UNIPHIER=y
-CONFIG_NAND_DENALI=y
-CONFIG_SYS_NAND_DENALI_64BIT=y
-CONFIG_NAND_DENALI_SPARE_AREA_SKIP_BYTES=8
-CONFIG_SPL_NAND_DENALI=y
-CONFIG_USB=y
-CONFIG_USB_EHCI_HCD=y
-CONFIG_USB_EHCI_GENERIC=y
-CONFIG_USB_STORAGE=y