x86: give FIX_EFI_MPF its own fixmap entry

FIX_EFI_MPF was the same as FIX_KEXEC_BASE_0 which is going away.  So
add its own entry.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Tested-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Don Slutz <dslutz@verizon.com>
Tested-by: Don Slutz <dslutz@verizon.com>
Acked-by: Keir Fraser <keir@xen.org>

xen/arch/x86/mpparse.c

@@ -538,8 +538,6 @@ static inline void __init construct_default_ISA_mptable(int mpc_default_type)
 	}
 }
 
-#define FIX_EFI_MPF FIX_KEXEC_BASE_0
-
 static __init void efi_unmap_mpf(void)
 {
 	if (efi_enabled)

xen/include/asm-x86/fixmap.h

@@ -66,6 +66,7 @@ enum fixed_addresses {
     FIX_APEI_RANGE_BASE,
     FIX_APEI_RANGE_END = FIX_APEI_RANGE_BASE + FIX_APEI_RANGE_MAX -1,
     FIX_IGD_MMIO,
+    FIX_EFI_MPF,
     __end_of_fixed_addresses
 };