[MIPS] Move PHY_OFFSET definition in spaces.h

Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/include/asm-mips/mach-generic/spaces.h b/include/asm-mips/mach-generic/spaces.h
index f0571b65..c9fa4b1 100644
--- a/include/asm-mips/mach-generic/spaces.h
+++ b/include/asm-mips/mach-generic/spaces.h
@@ -12,6 +12,13 @@
 
 #include <linux/const.h>
 
+/*
+ * This gives the physical RAM offset.
+ */
+#ifndef PHYS_OFFSET
+#define PHYS_OFFSET		_AC(0, UL)
+#endif
+
 #ifdef CONFIG_32BIT
 
 #define CAC_BASE		_AC(0x80000000, UL)