x86: Fix build with the get/set_reg() infrastructure

x86: Fix build with the get/set_reg() infrastructure

I clearly messed up concluding that the stubs were safe to drop.

The is_{pv,hvm}_domain() predicates are not symmetrical with both CONFIG_PV
and CONFIG_HVM.  As a result logic of the form `if ( pv/hvm ) ... else ...`
will always have one side which can't be DCE'd.

While technically only the hvm stubs are needed, due to the use of the
is_pv_domain() predicate in guest_{rd,wr}msr(), sort out the pv stubs too to
avoid leaving a bear trap for future users.

Fixes: 88d3ff7ab15d ("x86/guest: Introduce {get,set}_reg() infrastructure")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>