arm/xen: define xen_remap as ioremap_cached

Define xen_remap as ioremap_cache (MT_MEMORY and MT_DEVICE_CACHED end up
having the same AttrIndx encoding).

Remove include asm/mach/map.h, not unneeded.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

arch/arm/include/asm/xen/page.h

 #ifndef _ASM_ARM_XEN_PAGE_H
 #define _ASM_ARM_XEN_PAGE_H
 
-#include <asm/mach/map.h>
 #include <asm/page.h>
 #include <asm/pgtable.h>
 
@@ -88,6 +87,6 @@ static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
 	return __set_phys_to_machine(pfn, mfn);
 }
 
-#define xen_remap(cookie, size) __arm_ioremap((cookie), (size), MT_MEMORY);
+#define xen_remap(cookie, size) ioremap_cached((cookie), (size));
 
 #endif /* _ASM_ARM_XEN_PAGE_H */