MLK-12436-8: imx: mx6qsabreauto: misc board update

MLK-12436-8: imx: mx6qsabreauto: misc board update

To Align with imx_v2016.03.
1. Add USDHC1 support on mother board
2. Add SPINOR flash support.
3. Add enet ref clk pinmux setting and enet settings
4. Use CONFIG_SYS_USE_EIMNOR to wrap eimnor settings.
5. update mmc board settings
6. update board_init and move nand settings to board_init, but not in
   board_early_init_f
7. update pmic settings to align with datasheet.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
(cherry picked from commit f05f2281548ab7b47f69b2c517eb6f85ad09a5d2)
Signed-off-by: Ye Li <ye.li@nxp.com>