MLK-14326-3 mx6qsabreauto: Enable OF_CONTROL and DM driver

MLK-14326-3 mx6qsabreauto: Enable OF_CONTROL and DM driver

Enable OF_CONTROL and DM driver on mx6qsabreauto.
1. Add the imx6qsabreauto relevant DTS file for using DTB.
2. Modify PMIC initialization codes to use DM PMIC driver.
3. Modify to use PCA953X DM driver
4. Remove NAND from default, since the default imx6q-sabreauto.dts disabled
   the nand. The pins are conflicted with UART3, while UART3 is enabled.
5. For NAND build configuration, remove the USB, since the imx6q-sabreauto-gpmi-weim.dts
   will have pin conflicts on steer logic.
6. GPIO requests added.

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