dtoverlays: Add an override for imx477 and 378 for higher link freq

The driver can now support a link freq of 900MHz (1.8Gbit/s/lane)
for higher frame rates.

Add an override for "pi5" that changes this link frequency.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

Author: 6by9

arch/arm/boot/dts/overlays/README

@@ -2780,6 +2780,7 @@ Params: rotation                Mounting rotation of the camera sensor (0 or
                                 camera clamping I/Os such as XVS to 0V.
         sync-source             Configure as vsync source
         sync-sink               Configure as vsync sink
+        pi5                     Doubles CSI2 clock frequency
 
 
 Name:   imx462
@@ -2822,6 +2823,7 @@ Params: rotation                Mounting rotation of the camera sensor (0 or
                                 camera clamping I/Os such as XVS to 0V.
         sync-source             Configure as vsync source
         sync-sink               Configure as vsync sink
+        pi5                     Doubles CSI2 clock frequency
 
 
 Name:   imx500

arch/arm/boot/dts/overlays/imx477_378-overlay.dtsi

@@ -80,6 +80,7 @@
 		       <&cam_node>, "clocks:0=",<&cam0_clk>,
 		       <&cam_node>, "VANA-supply:0=",<&cam0_reg>;
 		always-on = <0>, "+99";
+		pi5 = <&cam_endpoint>, "link-frequencies#0=900000000";
 	};
 };