some cleanup: remove unused functions

Index: kvm/drivers/kvm/x86_emulate.c
===================================================================
@@ -1598,42 +1598,3 @@ cannot_emulate:
 	DPRINTF("Cannot emulate %02x\n", b);
 	return -1;
 }
-
-#ifdef __XEN__
-
-#include <asm/mm.h>
-#include <asm/uaccess.h>
-
-int
-x86_emulate_read_std(unsigned long addr,
-		     unsigned long *val,
-		     unsigned int bytes, struct x86_emulate_ctxt *ctxt)
-{
-	unsigned int rc;
-
-	*val = 0;
-
-	if ((rc = copy_from_user((void *)val, (void *)addr, bytes)) != 0) {
-		propagate_page_fault(addr + bytes - rc, 0);	/* read fault */
-		return X86EMUL_PROPAGATE_FAULT;
-	}
-
-	return X86EMUL_CONTINUE;
-}
-
-int
-x86_emulate_write_std(unsigned long addr,
-		      unsigned long val,
-		      unsigned int bytes, struct x86_emulate_ctxt *ctxt)
-{
-	unsigned int rc;
-
-	if ((rc = copy_to_user((void *)addr, (void *)&val, bytes)) != 0) {
-		propagate_page_fault(addr + bytes - rc, PGERR_write_access);
-		return X86EMUL_PROPAGATE_FAULT;
-	}
-
-	return X86EMUL_CONTINUE;
-}
-
-#endif