pinctrl: add i.MXRT driver

Add i.MXRT pinctrl driver.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
diff --git a/drivers/pinctrl/nxp/Makefile b/drivers/pinctrl/nxp/Makefile
index b86448a..066ca75 100644
--- a/drivers/pinctrl/nxp/Makefile
+++ b/drivers/pinctrl/nxp/Makefile
@@ -8,3 +8,4 @@
 obj-$(CONFIG_PINCTRL_IMX8M)		+= pinctrl-imx8m.o
 obj-$(CONFIG_PINCTRL_MXS)		+= pinctrl-mxs.o
 obj-$(CONFIG_PINCTRL_VYBRID)		+= pinctrl-vf610.o
+obj-$(CONFIG_PINCTRL_IMXRT)		+= pinctrl-imxrt.o