x86: Drop asm/byteorder.h

With the common code moved fully onto xen/byteorder.h, clean up the dregs.

It turns out that msi.h has not needed byteorder.h since the use of
__{BIG,LITTLE}_ENDIAN_BITFIELD was dropped in commit d58f3941ce ("x86/MSI:
use standard C types in structures/unions").

No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

xen/arch/x86/include/asm/byteorder.h

@@ -1,6 +0,0 @@
-#ifndef __ASM_X86_BYTEORDER_H__
-#define __ASM_X86_BYTEORDER_H__
-
-#include <xen/byteorder.h>
-
-#endif /* __ASM_X86_BYTEORDER_H__ */

xen/arch/x86/include/asm/msi.h

@@ -3,7 +3,6 @@
 
 #include <xen/cpumask.h>
 #include <xen/pci.h>
-#include <asm/byteorder.h>
 #include <asm/hvm/vmx/vmcs.h>
 
 /*