Exclude libpermission on Darwin

bug:189918791

Test: builds

Change-Id: Ice2ac3b95d9ddf3cdfe5083eb819ae40b91b18c5
diff --git a/libs/permission/Android.bp b/libs/permission/Android.bp
index b00021f..0eeca54 100644
--- a/libs/permission/Android.bp
+++ b/libs/permission/Android.bp
@@ -24,6 +24,11 @@
     name: "libpermission",
     host_supported: true,
     double_loadable: true,
+    target: {
+        darwin: {
+            enabled: false,
+        },
+    },
     cflags: [
         "-Wall",
         "-Wextra",