pinctrl: bcm283x: Add compatible for RPi4

The Raspberry Pi 4 upstream kernel device tree instroduces
a new compatible for the pinctroller. Add this to the driver
so that we can boot with the upstream kernel DT.

Signed-off-by: Matthias Brugger <mbrugger@suse.com>
diff --git a/drivers/pinctrl/broadcom/pinctrl-bcm283x.c b/drivers/pinctrl/broadcom/pinctrl-bcm283x.c
index 3be080d..8d9074e 100644
--- a/drivers/pinctrl/broadcom/pinctrl-bcm283x.c
+++ b/drivers/pinctrl/broadcom/pinctrl-bcm283x.c
@@ -99,6 +99,7 @@
 
 static const struct udevice_id bcm2835_pinctrl_id[] = {
 	{.compatible = "brcm,bcm2835-gpio"},
+	{.compatible = "brcm,bcm2711-gpio"},
 	{}
 };