libxc/migration: Drop unimplemented domain types

x86 PVH is completely obsolete - it was intended for legacy PVH before that
idea was abandoned.  There was an RFC series for ARM in 2015, but there is
plenty of outstanding work which hasn't been done yet.

No functional change.  New types can be (re)introduced with the code which
actually implements them.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Julien Grall <julien@xen.org>
Acked-by: Wei Liu <wl@xen.org>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>

tools/python/xen/migration/libxc.py

@@ -32,14 +32,10 @@ DHDR_FORMAT = "IHHII"
 
 DHDR_TYPE_x86_pv  = 0x00000001
 DHDR_TYPE_x86_hvm = 0x00000002
-DHDR_TYPE_x86_pvh = 0x00000003
-DHDR_TYPE_arm     = 0x00000004
 
 dhdr_type_to_str = {
     DHDR_TYPE_x86_pv  : "x86 PV",
     DHDR_TYPE_x86_hvm : "x86 HVM",
-    DHDR_TYPE_x86_pvh : "x86 PVH",
-    DHDR_TYPE_arm     : "ARM",
 }
 
 # Records