[PATCH] Arm: drop assertion from page_is_ram_type()

[Jan Beulich]

Its uses in offline_page() and query_page_offline() make it reachable on
Arm, as long as XEN_SYSCTL_page_offline_op doesn't have any Arm-specific
code added. It being reachable was even mentioned in the commit
introducing it, claiming it "clearly shouldn't be called on ARM just
yet".

Fixes: 214c4cd94a80 ("xen: arm: stub page_is_ram_type")
Signed-off-by: Jan Beulich <jbeul...@suse.com>

--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -66,7 +66,6 @@ int steal_page(
 
 int page_is_ram_type(unsigned long mfn, unsigned long mem_type)
 {
-    ASSERT_UNREACHABLE();
     return 0;
 }