ARM: dts: imx27-eukrea-cpuimx27: Put the clock node directly into root

Put the UART clock node directly under root with a unique node name and
drop unit-address in order to fix the following build warning with W=1:

arch/arm/boot/dts/imx27-eukrea-mbimxsd27-baseboard.dtb: Warning (simple_bus_reg): Node /clocks/osc26m missing or empty reg/ranges property
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx27-eukrea-cpuimx27.dtsi

@@ -20,17 +20,10 @@ memory@a0000000 {
 		reg = <0xa0000000 0x04000000>;
 	};
 
-	clocks {
-		#address-cells = <1>;
-		#size-cells = <0>;
-		compatible = "simple-bus";
-
-		clk14745600: clock@0 {
-			#clock-cells = <0>;
-			compatible = "fixed-clock";
-			clock-frequency = <14745600>;
-			reg = <0>;
-		};
+	clk14745600: clk-uart {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <14745600>;
 	};
 };