1. Add weimnor boot defconfig
2. move CONFIG_FSL_USDHC and CONFIG_VIDEO to board header
3. Add CONFIG_SYS_FLASH_PROTECTION for mx6ul 14x14 lpddr2 arm2
4. correct CONFIG_SYS_FLASH_SECT_SIZE and CONFIG_SYS_MAX_FLASH_SECT
5. Add comments for setup_eimnor, since ENET2_RXER pin conflicts
with ENET2. Also eimnor support will disable SD1/SD2, need ENET
to boot kernel and nfs using enet. So setup_eimnor should be
invoked after setup_fec
Signed-off-by: Peng Fan