[ARM] pnx4008: fix definition of PHYS_OFFSET

PHYS_OFFSET constants should be defined using UL().
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-pnx4008/include/mach/memory.h

@@ -16,6 +16,6 @@
 /*
  * Physical DRAM offset.
  */
-#define PHYS_OFFSET     (0x80000000)
+#define PHYS_OFFSET	UL(0x80000000)
 
 #endif