rockchip: rk3308-rock-pi-s: Remove unnecessary u-boot dtsi overrides

With the emmc and uart0 DT nodes updated to v6.11-rc1 in dts/upstream
there is no longer any need to keep overrides in board u-boot dtsi.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/rk3308-rock-pi-s-u-boot.dtsi b/arch/arm/dts/rk3308-rock-pi-s-u-boot.dtsi
index a6fb8b1..ff5bab3 100644
--- a/arch/arm/dts/rk3308-rock-pi-s-u-boot.dtsi
+++ b/arch/arm/dts/rk3308-rock-pi-s-u-boot.dtsi
@@ -4,17 +4,6 @@
  */
 #include "rk3308-u-boot.dtsi"
 
-&emmc {
-	cap-sd-highspeed;
-	pinctrl-names = "default";
-	pinctrl-0 = <&emmc_clk &emmc_cmd &emmc_bus4>;
-};
-
-&emmc_bus4 {
-	bootph-pre-ram;
-	bootph-some-ram;
-};
-
 &u2phy_otg {
 	/delete-property/ phy-supply;
 };
@@ -24,14 +13,6 @@
 	clock-frequency = <24000000>;
 };
 
-&uart0_cts {
-	bootph-all;
-};
-
-&uart0_rts {
-	bootph-all;
-};
-
 &uart0_xfer {
 	bootph-all;
 };