mxs_nand: Update compatible string for i.MX6SX

The iMX6SX uses compatible string "fsl,imx6sx-gpmi-nand" for gpmi
node in DTS, so update the driver for the string

Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
1 file changed