x86/altp2m: use __get_gfn_type_access to avoid lock conflicts

x86/altp2m: use __get_gfn_type_access to avoid lock conflicts

Use __get_gfn_type_access instead of get_gfn_type_access when checking
the hostp2m entries during altp2m mem_access setting and gfn remapping
to avoid a lock conflict which can make dom0 freeze. During mem_access
setting the hp2m is already locked. For gfn remapping we change the flow
to lock the hp2m before locking the ap2m.

Signed-off-by: Tamas K Lengyel <tamas.lengyel@zentific.com>
Reviewed-by: Razvan Cojocaru <rcojocaru@bitdefender.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Acked-by: George Dunlap <george.dunlap@citrix.com>