According to 8MM/MN/MP reference manual, their pad registers only have 4 valid DSE values. And DSE2 and DSE4 are different with current definitions in iomux-v3.h. Fix the issue to align with manual. Signed-off-by: Ye Li <ye.li@nxp.com> Acked-by: Peng Fan <peng.fan@nxp.com>