KVM: arm64: Fix memory check in host_stage2_set_owner_locked()

I found this simple bug while preparing some patches for pKVM.
AFAICT, it should be harmless (besides crashing the kernel if it
was misbehaving)

Fixes: e94a7de ("KVM: arm64: Move host page ownership tracking to the hyp vmemmap")
Signed-off-by: Mostafa Saleh <smostafa@google.com>
Link: https://lore.kernel.org/r/20250501162450.2784043-1-smostafa@google.com
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

arch/arm64/kvm/hyp/nvhe/mem_protect.c

@@ -503,7 +503,7 @@ int host_stage2_set_owner_locked(phys_addr_t addr, u64 size, u8 owner_id)
 {
 	int ret;
 
-	if (!addr_is_memory(addr))
+	if (!range_is_memory(addr, addr + size))
 		return -EPERM;
 
 	ret = host_stage2_try(kvm_pgtable_stage2_set_owner, &host_mmu.pgt,