x86/emul: Correctly annotate all push/pop %sreg instructions

x86/emul: Correctly annotate all push/pop %sreg instructions

c/s 373923ed9c2 "x86emul: fix pushing of selector registers" redirected
all push %sreg instructions into the general push path.  However, this
ends up hitting the assertion at the head of the push path.

Annotate All push and pop %sreg instructions as Mov, indicating that
they do not read the destination operand.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Release-acked-by: Wei Liu <wei.liu2@citrix.com>