KVM: arm64: change parameter to const

Placeholder functions generates warnings when passed const
parameters.

No functional change intended.

Signed-off-by: Fuad Tabba <tabba@google.com>
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 8b4b1af..0718ae8 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -782,7 +782,7 @@
 
 int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type);
 
-static inline bool kvm_vm_is_protected(struct kvm *kvm)
+static inline bool kvm_vm_is_protected(const struct kvm *kvm)
 {
 	return false;
 }