x86/hvm: refine hap_has_{2mb,1gb} checks

x86/hvm: refine hap_has_{2mb,1gb} checks

HAP superpages are a host property and not dependent on domain configuration.
Drop the domain paramter (which was only used in one of the two callsites),
and drop the redundant hvm_ prefix to mirror the cpu_has_* style of feature
detection.

Finally, convert the checks to being proper booleans rather than just non-zero
integers.

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