arm64: dts: rockchip: remove the hdmi-cec pinctrl for rk3399 excavator

As the edp_hpd pinctrl is reused by hdmi-cec. So the rk3399 will hit the
pinctrl register failed on bootup.

Says: the failed log:
[0.927577] rockchip-pinctrl pinctrl: pin gpio4-23 already requested by
ff940000.hdmi; cannot claim for ff970000.edp
[0.928519 ] rockchip-pinctrl pinctrl: pin-151 (ff970000.edp) status -22
[0.929112] rockchip-pinctrl pinctrl: could not request pin 151
(gpio4-23) from group edp-hpd  on device rockchip-pinctr

That will cause the edp can't work on rk3399 SoCs.

Fixes: commit
6e4eaff ("arm64: dts: rockchip: add HDMI cec support for rk3399")

Change-Id: I8ba20db55025e33c082beda5160e0398f1681766
Signed-off-by: Caesar Wang <wxt@rock-chips.com>

Author: Caesar-github

arch/arm64/boot/dts/rockchip/rk3399-sapphire-excavator-linux.dts

@@ -218,6 +218,8 @@
 };
 
 &hdmi {
+	/* remove the hdmi_cec, reused by edp_hpd */
+	pinctrl-0 = <&hdmi_i2c_xfer>;
 	#address-cells = <1>;
 	#size-cells = <0>;
 	#sound-dai-cells = <0>;