ARM: dts: meson8: add the SDXC_A pins

Add the pins for the SDHC MMC controller which connect to the SDIO wifi
on some boards.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20230321171213.2808460-3-martin.blumenstingl@googlemail.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

Author: xdarklight

arch/arm/boot/dts/meson8.dtsi

@@ -506,6 +506,15 @@
 			};
 		};
 
+		sdxc_a_pins: sdxc-a {
+			mux {
+				groups = "sdxc_d0_a", "sdxc_d13_a",
+					 "sdxc_clk_a", "sdxc_cmd_a";
+				function = "sdxc_a";
+				bias-pull-up;
+			};
+		};
+
 		sdxc_b_pins: sdxc-b {
 			mux {
 				groups = "sdxc_d0_b", "sdxc_d13_b",