powerpc/83xx: Fix u-boot partion size for MPC8377E-WLAN boards

u-boot partition size should be 0x80000 (512 KB), not 0x8000 (32 KB).
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/boot/dts/mpc8377_wlan.dts

@@ -67,7 +67,7 @@ flash@0,0 {
 			device-width = <1>;
 
 			partition@0 {
-				reg = <0 0x8000>;
+				reg = <0 0x80000>;
 				label = "u-boot";
 				read-only;
 			};