imx: mx7dsabresd: enable more DM drivers

Enable more DM drivers. The imx I2C/MMC DM drivers needs DM_GPIO
enabled. The 74x164 drivers needs SOFT_SPI and DM_GPIO enabled.
So needs to enable them together.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>