dt-bindings: bcm2835-unicam: Update documentation with new clock params

raspberrypi inclusion
category: feature
bugzilla: 50432

--------------------------------

Update the documentation to reflect the new "VPU" clock needed
by the bcm2835-unicam driver.
Signed-off-by: NNaushir Patuck <naush@raspberrypi.com>
Signed-off-by: NFang Yafen <yafen@iscas.ac.cn>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

Documentation/devicetree/bindings/media/bcm2835-unicam.txt

@@ -20,7 +20,7 @@ Required properties:
 - interrupts	: should contain the IRQ line for this Unicam instance.
 - clocks	: list of clock specifiers, corresponding to entries in
 		  clock-names property.
-- clock-names	: must contain an "lp" entry, matching entries in the
+- clock-names	: must contain "lp" and "vpu" entries, matching entries in the
 		  clocks property.
 
 Unicam supports a single port node. It should contain one 'port' child node
@@ -46,9 +46,9 @@ Example:
 		reg = <0x7e801000 0x800>,
 		      <0x7e802004 0x4>;
 		interrupts = <2 7>;
-		clocks = <&clocks BCM2835_CLOCK_CAM1>;
-		clock-names = "lp";
-
+		clocks = <&clocks BCM2835_CLOCK_CAM1>,
+			 <&firmware_clocks 4>;
+		clock-names = "lp", "vpu";
 		port {
 			csi1_ep: endpoint {
 				remote-endpoint = <&tc358743_0>;