u-boot: Fix display initialization on gru boards

U-Boot has migrated to using upstream device-tree files for gru boards,
but the clock driver doesn't yet support setting rates for a certain
clock that upstream uses for the eDP display. It happens to work without
it, so for now remove the clock setting until the driver is fixed.

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>

config/u-boot/default/patches/0005-HACK-rk3399-gru-Remove-assigned-clock-dt-properties-.patch

@@ -0,0 +1,36 @@
+From 1107dc81b24743e77374f1b484a843d81fa0348a Mon Sep 17 00:00:00 2001
+From: Alper Nebi Yasak <alpernebiyasak@gmail.com>
+Date: Wed, 10 Jul 2024 14:32:19 +0300
+Subject: [PATCH] HACK: rk3399: gru: Remove assigned clock dt properties for
+ EDP node
+
+Having the PCLK_EDP clock in the assigned-clocks property of the `edp`
+node means that U-Boot tries to set its rate automatically. This clock
+isn't implemented for the RK3399 clock driver, so it fails and prevents
+display from being initialized.
+
+The display happens to work fine without it, remove the property until
+the clock driver can handle the clock.
+
+Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
+---
+ arch/arm/dts/rk3399-gru-u-boot.dtsi | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/arch/arm/dts/rk3399-gru-u-boot.dtsi b/arch/arm/dts/rk3399-gru-u-boot.dtsi
+index 487dde38d86a..30cfb58aca12 100644
+--- a/arch/arm/dts/rk3399-gru-u-boot.dtsi
++++ b/arch/arm/dts/rk3399-gru-u-boot.dtsi
+@@ -28,6 +28,9 @@ &cros_ec {
+ 
+ &edp {
+ 	rockchip,panel = <&edp_panel>;
++
++	/delete-property/ assigned-clocks;
++	/delete-property/ assigned-clock-rates;
+ };
+ 
+ &pp1800_audio {
+-- 
+2.45.2
+