Add MX6UL LPDDR2 ARM2 board BSP codes, supported peripherals: SD1, eMMC(USDHC2), USB OTG1, I2C, ENET2, PMIC.
Due to a board issue, the SD1 only supports 1 bit bus width.
Signed-off-by: Ye.Li
CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/freescale/mx6ul_14x14_lpddr2_arm2/imximage.cfg,MX6UL" CONFIG_ARM=y CONFIG_TARGET_MX6UL_14X14_LPDDR2_ARM2=y CONFIG_SYS_MALLOC_F=y CONFIG_SYS_MALLOC_F_LEN=0x400 CONFIG_DM=y CONFIG_DM_THERMAL=y