MLK-18457-3 configs: mx6ul_arm2: Add defconfigs for 14x14 DDR3/LPDDR2 ARM2

Add defconfigs for iMX6UL 14x14 DDR3/LPDDR2 ARM2 boards to support
SD boot, eMMC boot, NAND boot, QSPI boot, SPINOR boot, EIMNOR boot
and plugin.

Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit 4cd4d3d9454ac64fae371ec5873d71b201f035b1)
(cherry picked from commit b39fe7d4ed08fecb9e531f50bc4067faf11678d9)
9 files changed