MIPS: SGI-IP22: set PHYS_OFFSET to memory start

IP22 started at physical 0x08000000. To avoid wasting memory for
page structs set PHYS_OFFSET.
Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

arch/mips/include/asm/mach-ip22/spaces.h

@@ -10,11 +10,10 @@
 #ifndef _ASM_MACH_IP22_SPACES_H
 #define _ASM_MACH_IP22_SPACES_H
 
+#define PHYS_OFFSET     _AC(0x08000000, UL)
 
 #ifdef CONFIG_64BIT
 
-#define PAGE_OFFSET		0xffffffff80000000UL
-
 #define CAC_BASE		0xffffffff80000000
 #define IO_BASE			0xffffffffa0000000
 #define UNCAC_BASE		0xffffffffa0000000