pinctrl: meson: Add GXL Support

Add the Amlogic Meson GXL pinctrl support based on the GXBB driver and
the synchronized DTS from Linux 4.13.5

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Beniamino Galvani <b.galvani@gmail.com>
diff --git a/drivers/pinctrl/meson/Makefile b/drivers/pinctrl/meson/Makefile
index 6dde4bc..18921e3 100644
--- a/drivers/pinctrl/meson/Makefile
+++ b/drivers/pinctrl/meson/Makefile
@@ -4,3 +4,4 @@
 
 obj-y					+= pinctrl-meson.o
 obj-$(CONFIG_PINCTRL_MESON_GXBB)	+= pinctrl-meson-gxbb.o
+obj-$(CONFIG_PINCTRL_MESON_GXL)		+= pinctrl-meson-gxl.o