x86: xen: remove STACK_FRAME_NON_STANDARD from xen_cpuid

Since commit 4d65adfcd119 ("x86: xen: insn: Decode Xen and KVM
emulate-prefix signature"), objtool is able to correctly parse the
prefixed instruction in xen_cpuid and emit correct orc unwind
information. Hence, marking the function as STACKFRAME_NON_STANDARD is
no longer needed.

This commit is basically a revert of commit 983bb6d254c7 ("x86/xen: Mark
xen_cpuid() stack frame as non-standard").

Signed-off-by: Maximilian Heyne <[e-mail]>
Reviewed-by: Juergen Gross <[e-mail]>
CC: Josh Poimboeuf <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Juergen Gross <[e-mail]>

arch/x86/xen/enlighten_pv.c

···
 #include <linux/pci.h>
 #include <linux/gfp.h>
 #include <linux/edd.h>
-#include <linux/objtool.h>
 
 #include <xen/xen.h>
 #include <xen/events.h>
···
 
 	*bx &= maskebx;
 }
-STACK_FRAME_NON_STANDARD(xen_cpuid); /* XEN_EMULATE_PREFIX */
 
 static bool __init xen_check_mwait(void)
 {