OMAP3: am3517_evm: Add NAND MTD partitions with UBI/UBIFS support

- Add required UBI/UBIFS config definitions
- Add reasonable MTD partition layout
- Remove JFFS2 config definitions
- Drop some CFI verbage and definitions
- Make comment 'one-liners' truly one line
- Improve readability and content arrangement

Signed-off-by: Derald D. Woods <woods.technical@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/am3517_evm_defconfig b/configs/am3517_evm_defconfig
index cde84fe..c7699e0 100644
--- a/configs/am3517_evm_defconfig
+++ b/configs/am3517_evm_defconfig
@@ -4,9 +4,11 @@
 CONFIG_SPL=y
 CONFIG_FIT=y
 CONFIG_SYS_PROMPT="AM3517_EVM # "
+CONFIG_SYS_EXTRA_OPTIONS="NAND"
 # CONFIG_CMD_IMI is not set
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set
 # CONFIG_CMD_FPGA is not set
 # CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_GPIO=y
 CONFIG_SYS_NS16550=y