rockchip: rk3308: Remove OTP device node from soc u-boot dtsi

The merged upstream DT node for OTP differs in nodename and will cause
following build errors once rk3308.dtsi in dts/upstream is updated:

  ERROR (duplicate_label): /nvmem@ff210000: Duplicate label 'otp' on /nvmem@ff210000 and /efuse@ff210000
  ERROR (duplicate_label): /nvmem@ff210000/id@7: Duplicate label 'cpu_id' on /nvmem@ff210000/id@7 and /efuse@ff210000/id@7

Remove the OTP device node from soc u-boot dtsi in preparation for
replacing it with the merged upstream DT node in dts/upstream.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/rk3308-u-boot.dtsi b/arch/arm/dts/rk3308-u-boot.dtsi
index 684fa7a..b7964e2 100644
--- a/arch/arm/dts/rk3308-u-boot.dtsi
+++ b/arch/arm/dts/rk3308-u-boot.dtsi
@@ -21,22 +21,6 @@
 		bootph-all;
 	};
 
-	otp: nvmem@ff210000 {
-		compatible = "rockchip,rk3308-otp";
-		reg = <0x0 0xff210000 0x0 0x4000>;
-		clocks = <&cru SCLK_OTP_USR>, <&cru PCLK_OTP_NS>,
-			 <&cru PCLK_OTP_PHY>;
-		clock-names = "otp", "apb_pclk", "phy";
-		resets = <&cru SRST_OTP_PHY>;
-		reset-names = "phy";
-		#address-cells = <1>;
-		#size-cells = <1>;
-
-		cpu_id: id@7 {
-			reg = <0x07 0x10>;
-		};
-	};
-
 	rng: rng@ff2f0000 {
 		compatible = "rockchip,cryptov2-rng";
 		reg = <0x0 0xff2f0000 0x0 0x4000>;