x86: Use asm-generic/io.h

Convert the x86 architecture to make use of the new asm-generic/io.h to
provide address mapping functions. As the generic implementations are
suitable for x86 this is primarily a matter of moving code.

This has only been build-tested, feedback from architecture maintainers
is welcome.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/x86/include/asm/io.h

@@ -231,35 +231,6 @@ static inline void sync(void)
 }
 
 /*
- * Given a physical address and a length, return a virtual address
- * that can be used to access the memory range with the caching
- * properties specified by "flags".
- */
-#define MAP_NOCACHE	(0)
-#define MAP_WRCOMBINE	(0)
-#define MAP_WRBACK	(0)
-#define MAP_WRTHROUGH	(0)
-
-static inline void *
-map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
-{
-	return (void *)(uintptr_t)paddr;
-}
-
-/*
- * Take down a mapping set up by map_physmem().
- */
-static inline void unmap_physmem(void *vaddr, unsigned long flags)
-{
-
-}
-
-static inline phys_addr_t virt_to_phys(void * vaddr)
-{
-	return (phys_addr_t)(uintptr_t)(vaddr);
-}
-
-/*
  * TODO: The kernel offers some more advanced versions of barriers, it might
  * have some advantages to use them instead of the simple one here.
  */
@@ -267,4 +238,6 @@ static inline phys_addr_t virt_to_phys(void * vaddr)
 #define __iormb()	dmb()
 #define __iowmb()	dmb()
 
+#include <asm-generic/io.h>
+
 #endif /* _ASM_IO_H */