pinctrl: Add i.MX7ULP pinctrl driver

Add i.MX7ULP pinctrl driver.
Select CONFIG_PINCTRL_IMX7ULP to use this driver.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by : Stefano Babic <sbabic@denx.de>
diff --git a/drivers/pinctrl/nxp/Makefile b/drivers/pinctrl/nxp/Makefile
index e0f7325..c763948 100644
--- a/drivers/pinctrl/nxp/Makefile
+++ b/drivers/pinctrl/nxp/Makefile
@@ -2,3 +2,4 @@
 obj-$(CONFIG_PINCTRL_IMX5)		+= pinctrl-imx5.o
 obj-$(CONFIG_PINCTRL_IMX6)		+= pinctrl-imx6.o
 obj-$(CONFIG_PINCTRL_IMX7)		+= pinctrl-imx7.o
+obj-$(CONFIG_PINCTRL_IMX7ULP)		+= pinctrl-imx7ulp.o