x86/MCE: switch some callback invocations to altcall

x86/MCE: switch some callback invocations to altcall

While not performance critical, these hook invocations still would
better be converted: This way all pre-filled (and newly introduced)
struct mce_callback instances can become __initconst_cf_clobber, thus
allowing to eliminate another 9 ENDBR during the 2nd phase of
alternatives patching.

While this means registering callbacks a little earlier, doing so is
perhaps even advantageous, for having pointers be non-NULL earlier on.
Only one set of callbacks would only ever be registered anyway, and
neither of the respective initialization function can (subsequently)
fail.

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