configs: am3517-evm: Setup NAND booting

The NAND offsets for the kernel and U-Boot were missing.
This patch sets up the offsets so the AM3517-EVM can boot from NAND
when DIP switches S7:1 and S7:4 are to the OFF position

Signed-off-by: Adam Ford <aford173@gmail.com>

configs/am3517_evm_defconfig

@@ -18,6 +18,9 @@ CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL_MTD_SUPPORT=y
 CONFIG_SYS_PROMPT="AM3517_EVM # "
 # CONFIG_CMD_IMI is not set
+CONFIG_CMD_SPL=y
+CONFIG_CMD_SPL_NAND_OFS=0xaa0000
+CONFIG_CMD_SPL_WRITE_SIZE=0x20000
 # CONFIG_CMD_EEPROM is not set
 # CONFIG_CMD_FLASH is not set
 # CONFIG_CMD_GPT is not set
@@ -37,6 +40,8 @@ CONFIG_ENV_IS_IN_NAND=y
 CONFIG_MMC_OMAP_HS=y
 CONFIG_NAND=y
 CONFIG_SYS_NAND_BUSWIDTH_16BIT=y
+CONFIG_SYS_NAND_U_BOOT_LOCATIONS=y
+CONFIG_SYS_NAND_U_BOOT_OFFS=0x80000
 CONFIG_SPL_NAND_SIMPLE=y
 CONFIG_CONS_INDEX=3
 CONFIG_SYS_NS16550=y