uboot-imx

MLK-21864 mx7ulp_evk: Fix build break in eMMC defconfig

Since the non-DM QSPI support is removed in 2019.04 u-boot, we have
to enable DM QSPI driver, otherwise will get build fail.

Also add missed CONFIG_CMD_BOOTZ to plugin defconfig.

Signed-off-by: Ye Li <ye.li@nxp.com>