staging: mt7621-dts: change palmbus address to lower case

Hexadecimal addresses in device tree must be defined using lower case.
Change missing one in 'gbpc1.dts' file.
Signed-off-by: NSergio Paracuellos <sergio.paracuellos@gmail.com>
Link: https://lore.kernel.org/r/20211019102915.15409-1-sergio.paracuellos@gmail.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-dts/gbpc1.dts

@@ -18,7 +18,7 @@
 		bootargs = "console=ttyS0,57600";
 	};
 
-	palmbus: palmbus@1E000000 {
+	palmbus: palmbus@1e000000 {
 		i2c@900 {
 			status = "okay";
 		};