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/Kconfig b/drivers/pinctrl/meson/Kconfig
index c3e6901..27ba890 100644
--- a/drivers/pinctrl/meson/Kconfig
+++ b/drivers/pinctrl/meson/Kconfig
@@ -8,4 +8,8 @@
 	bool "Amlogic Meson GXBB SoC pinctrl driver"
 	select PINCTRL_MESON
 
+config PINCTRL_MESON_GXL
+	bool "Amlogic Meson GXL SoC pinctrl driver"
+	select PINCTRL_MESON
+
 endif