ARM: dts: ls1021a: remove clock-names property for i2c nodes

The property is optional and not used in matching the clock in driver.
Remove it to avoid dtbs_check issues.
Signed-off-by: Li Yang <leoyang.li@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/ls1021a.dtsi

@@ -394,7 +394,6 @@ i2c0: i2c@2180000 {
 			#size-cells = <0>;
 			reg = <0x0 0x2180000 0x0 0x10000>;
 			interrupts = <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>;
-			clock-names = "i2c";
 			clocks = <&clockgen 4 1>;
 			dma-names = "tx", "rx";
 			dmas = <&edma0 1 39>, <&edma0 1 38>;
@@ -407,7 +406,6 @@ i2c1: i2c@2190000 {
 			#size-cells = <0>;
 			reg = <0x0 0x2190000 0x0 0x10000>;
 			interrupts = <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>;
-			clock-names = "i2c";
 			clocks = <&clockgen 4 1>;
 			dma-names = "tx", "rx";
 			dmas = <&edma0 1 37>, <&edma0 1 36>;
@@ -420,7 +418,6 @@ i2c2: i2c@21a0000 {
 			#size-cells = <0>;
 			reg = <0x0 0x21a0000 0x0 0x10000>;
 			interrupts = <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>;
-			clock-names = "i2c";
 			clocks = <&clockgen 4 1>;
 			dma-names = "tx", "rx";
 			dmas = <&edma0 1 35>, <&edma0 1 34>;