arm64: zynqmp: fix i2c mux bus description for m-a2197 platforms

Uncomment reg property for bus 3 in i2c mux. It is better option than
removing the whole node.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/f28ff644fd2c6bdf5f2e646f6bc0e1ad0c92e8be.1726219714.git.michal.simek@amd.com
diff --git a/arch/arm/dts/zynqmp-m-a2197-03-revA.dts b/arch/arm/dts/zynqmp-m-a2197-03-revA.dts
index b2d477e..f3994bc 100644
--- a/arch/arm/dts/zynqmp-m-a2197-03-revA.dts
+++ b/arch/arm/dts/zynqmp-m-a2197-03-revA.dts
@@ -292,7 +292,7 @@
 		i2c@3 { /* MEM PMBUS - FIXME bug in schematics */
 			#address-cells = <1>;
 			#size-cells = <0>;
-			/* reg = <3>; */
+			reg = <3>;
 		};
 		i2c@4 { /* LP_I2C_SM */
 			#address-cells = <1>;