treewide: Migrate CONFIG_BOARD_EARLY_INIT_R to Kconfig

common/Kconfig

configs/B4420QDS_NAND_defconfig

configs/B4420QDS_SPIFLASH_defconfig

configs/B4420QDS_defconfig

configs/B4860QDS_NAND_defconfig

configs/B4860QDS_SECURE_BOOT_defconfig

configs/B4860QDS_SPIFLASH_defconfig

configs/B4860QDS_SRIO_PCIE_BOOT_defconfig

configs/B4860QDS_defconfig

configs/BSC9132QDS_NAND_DDRCLK100_SECURE_defconfig

configs/BSC9132QDS_NAND_DDRCLK100_defconfig

configs/BSC9132QDS_NAND_DDRCLK133_SECURE_defconfig

configs/BSC9132QDS_NAND_DDRCLK133_defconfig

configs/BSC9132QDS_NOR_DDRCLK100_SECURE_defconfig

configs/BSC9132QDS_NOR_DDRCLK100_defconfig

configs/BSC9132QDS_NOR_DDRCLK133_SECURE_defconfig

configs/BSC9132QDS_NOR_DDRCLK133_defconfig

configs/BSC9132QDS_SDCARD_DDRCLK100_SECURE_defconfig

configs/BSC9132QDS_SDCARD_DDRCLK100_defconfig

configs/BSC9132QDS_SDCARD_DDRCLK133_SECURE_defconfig