This cousin to gpio-mpc8xxx was lacking a multiple pins method,
add one.
Signed-off-by: NJoakim Tjernlund <joakim.tjernlund@infinera.com>
Reviewed-by: NQiang Zhao <qiang.zhao@nxp.com>
Signed-off-by: NLi Yang <leoyang.li@nxp.com>