MLK-11827 arm: imx6sx: correct the wrong qspi dts configures

- previous patch makes the wrong qspi port on imx6sx sdb and
sabreauto boards.
- nor flash is used qspi2 on imx6sx-sdb board, and qspi1 on
sabreauto board.

Signed-off-by: Richard Zhu <Richard.Zhu@freescale.com>
2 files changed