Revert "ARM: dts: rockchip: drop grf reference from rk3036 hdmi"

This reverts commit 1580ccb.

The HSYNC/VSYNC polarity of rk3036 HDMI are controlled by GRF.
Without the polarity configuration in GRF, it can be observed from
the HDMI protocol analyzer that the H/V front/back timing output
by RK3036 HDMI are currently not in line with the specifications.

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Tested-by: Heiko Stuebner <heiko@sntech.de> #rk3036-kylin
Link: https://lore.kernel.org/r/20250422070455.432666-7-andyshrk@163.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: Andy Yan

arch/arm/boot/dts/rockchip/rk3036.dtsi

@@ -400,6 +400,7 @@
 		interrupts = <GIC_SPI 45 IRQ_TYPE_LEVEL_HIGH>;
 		clocks = <&cru PCLK_HDMI>, <&cru SCLK_LCDC>;
 		clock-names = "pclk", "ref";
+		rockchip,grf = <&grf>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&hdmi_ctl>;
 		#sound-dai-cells = <0>;