pinctrl: Add missing newline in .dtsi

Add a missing newline between two groups in the pin control .dtsi
file for the ch32v003evt and the linkw board to comply with style
rules.

Signed-off-by: Miguel Gazquez <miguel.gazquez@bootlin.com>

boards/wch/ch32v003evt/ch32v003evt-pinctrl.dtsi

@@ -13,6 +13,7 @@
 			drive-push-pull;
 			slew-rate = "max-speed-10mhz";
 		};
+
 		group2 {
 			pinmux = <USART1_RX_PD6_0>;
 			bias-pull-up;

boards/wch/linkw/linkw-pinctrl.dtsi

@@ -13,6 +13,7 @@
 			drive-push-pull;
 			slew-rate = "max-speed-10mhz";
 		};
+
 		group2 {
 			pinmux = <USART2_RX_PA3_0>;
 			bias-pull-up;