[MIPS] Update <asm/addrspace.h> header

- Fix traditional KSEG names
- Replace PHYSADDR with CPHYSADDR

Signed-off-by: Shinya Kuribayashi <skuribay@ruby.dti.ne.jp>
diff --git a/include/asm-mips/io.h b/include/asm-mips/io.h
index 7137072..3a0f33f 100644
--- a/include/asm-mips/io.h
+++ b/include/asm-mips/io.h
@@ -120,7 +120,7 @@
  */
 extern inline unsigned long virt_to_phys(volatile void * address)
 {
-	return PHYSADDR(address);
+	return CPHYSADDR(address);
 }
 
 extern inline void * phys_to_virt(unsigned long address)
@@ -133,7 +133,7 @@
  */
 extern inline unsigned long virt_to_bus(volatile void * address)
 {
-	return PHYSADDR(address);
+	return CPHYSADDR(address);
 }
 
 extern inline void * bus_to_virt(unsigned long address)