ANDROID: KVM: arm64: Fix pKVM module handler registration

A typo in cmpxchg inverted the old and new value. The registration is
silently failing. Fix this.

Bug: 357781595
Bug: 382397533
Bug: 397325645
Fixes: 0a901ecd7f ("ANDROID: KVM: arm64: Rework pKVM module fault handler")
Change-Id: I442aebe4ec24a8dda09b64f3de1110511c4d5d84
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>

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

@@ -144,7 +144,7 @@ static int mod_handler_register(enum mod_handler_type type, void *handler)
 	int i;
 
 	for (i = 0; i < MAX_MOD_HANDLERS; i++) {
-		if (!cmpxchg64_release(&mod_handlers[type][i], handler, NULL))
+		if (!cmpxchg64_release(&mod_handlers[type][i], NULL, handler))
 			return 0;
 	}