- Re-org env sections so that we can fall back to env is in FAT on SD
card, for broader board compatibility
- Add am335x_evm_nandboot as example of NAND env
This is for the TI integration tree only as the plan for upstream is to
work towards env location being selectable via Kconfig
Signed-off-by: Tom Rini
Signed-off-by: Lokesh Vutla