refactor(tc): remove redundant macro UARTCLK_FREQ

remove redundant macro UARTCLK_FREQ and replace it with TC_UARTCLK
in dts.

Change-Id: Id463a9ddc1588278e552ffca3dfb738676229ce7
Signed-off-by: Jagdish Gediya <jagdish.gediya@arm.com>
Signed-off-by: Icen.Zeyada <Icen.Zeyada2@arm.com>
diff --git a/fdts/tc-base.dtsi b/fdts/tc-base.dtsi
index e898399..691a3b8 100644
--- a/fdts/tc-base.dtsi
+++ b/fdts/tc-base.dtsi
@@ -387,7 +387,7 @@
 	soc_uartclk: uartclk {
 		compatible = "fixed-clock";
 		#clock-cells = <0>;
-		clock-frequency = <UARTCLK_FREQ>;
+		clock-frequency = <TC_UARTCLK>;
 		clock-output-names = "uartclk";
 	};