ath79: drop unnecessary &uart node from dtsi of QCA955x devices

&uart (uart0) is already enabled in qca955x.dtsi by default.

Signed-off-by: INAGAKI Hiroshi <[email protected]>

target/linux/ath79/dts/qca9557_meraki_mr18.dts

@@ -171,10 +171,6 @@
 	};
 };
 
-&uart {
-	status = "okay";
-};
-
 &mdio0 {
 	status = "okay";
 

target/linux/ath79/dts/qca955x_elecom_wab.dtsi

@@ -227,10 +227,6 @@
 	};
 };
 
-&uart {
-	status = "okay";
-};
-
 &usb_phy0 {
 	status = "okay";
 };