ARM: io: simplify ioremap* and iounmap definitions

We don't need to repeat the same definitions of the ioremap*(),
once in terms of __arch_ioremap() and again in terms of __arm_ioremap().
Instead, if the platform hasn't provided an __arch_ioremap, define
this to be __arm_ioremap, and only define the ioremap*() set using
__arch_ioremap.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/include/asm/io.h

@@ -241,18 +241,15 @@ extern void _memset_io(volatile void __iomem *, int, size_t);
  *
  */
 #ifndef __arch_ioremap
-#define ioremap(cookie,size)		__arm_ioremap(cookie, size, MT_DEVICE)
-#define ioremap_nocache(cookie,size)	__arm_ioremap(cookie, size, MT_DEVICE)
-#define ioremap_cached(cookie,size)	__arm_ioremap(cookie, size, MT_DEVICE_CACHED)
-#define ioremap_wc(cookie,size)		__arm_ioremap(cookie, size, MT_DEVICE_WC)
-#define iounmap				__iounmap
-#else
+#define __arch_ioremap			__arm_ioremap
+#define __arch_iounmap			__iounmap
+#endif
+
 #define ioremap(cookie,size)		__arch_ioremap((cookie), (size), MT_DEVICE)
 #define ioremap_nocache(cookie,size)	__arch_ioremap((cookie), (size), MT_DEVICE)
 #define ioremap_cached(cookie,size)	__arch_ioremap((cookie), (size), MT_DEVICE_CACHED)
 #define ioremap_wc(cookie,size)		__arch_ioremap((cookie), (size), MT_DEVICE_WC)
 #define iounmap				__arch_iounmap
-#endif
 
 /*
  * io{read,write}{8,16,32} macros