pinctrl: add imx8m driver

Add i.mx8m pinctrl driver.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/drivers/pinctrl/nxp/Makefile b/drivers/pinctrl/nxp/Makefile
index 891ee6e..b340d94 100644
--- a/drivers/pinctrl/nxp/Makefile
+++ b/drivers/pinctrl/nxp/Makefile
@@ -5,4 +5,5 @@
 obj-$(CONFIG_PINCTRL_IMX7ULP)		+= pinctrl-imx7ulp.o
 obj-$(CONFIG_PINCTRL_IMX_SCU)		+= pinctrl-scu.o
 obj-$(CONFIG_PINCTRL_IMX8)		+= pinctrl-imx8.o
+obj-$(CONFIG_PINCTRL_IMX8M)		+= pinctrl-imx8m.o
 obj-$(CONFIG_PINCTRL_VYBRID)		+= pinctrl-vf610.o