arm64: dts: rockchip: Update VPLL Frequency for RGB30

Set the VPLL frequency for the RGB30 to 292.5MHz to support running
the 720x720 display panel at 59.97hz. Without this change, the panel
runs at 59.08hz.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Link: https://lore.kernel.org/r/20231018153357.343142-3-macroalpha82@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: macromorgan

arch/arm64/boot/dts/rockchip/rk3566-powkiddy-rgb30.dts

@@ -68,7 +68,7 @@
 	assigned-clocks = <&pmucru CLK_RTC_32K>, <&cru PLL_GPLL>,
 			  <&pmucru PLL_PPLL>, <&cru PLL_VPLL>;
 	assigned-clock-rates = <32768>, <1200000000>,
-			       <200000000>, <108000000>;
+			       <200000000>, <292500000>;
 };
 
 &gpio_keys_control {