dt-bindings: pinctrl: Document 7211 compatible for brcm, bcm2835-gpio.txt

Document the brcm,bcm7211-gpio compatible string in the
brcm,bcm2835-gpio.txt document.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200531001101.24945-2-f.fainelli@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt

@@ -9,6 +9,7 @@ Required properties:
   "brcm,bcm2835-gpio" - BCM2835 compatible pinctrl
   "brcm,bcm7211-gpio" - BCM7211 compatible pinctrl
   "brcm,bcm2711-gpio" - BCM2711 compatible pinctrl
+  "brcm,bcm7211-gpio" - BCM7211 compatible pinctrl
 - reg: Should contain the physical address of the GPIO module's registers.
 - gpio-controller: Marks the device node as a GPIO controller.
 - #gpio-cells : Should be two. The first cell is the pin number and the