Clean up hard-coded min_sdk_version/apex_available

Set min_sdk_version/apex_available for modules used by
com.android.permission APEX.

Bug: 147364041
Bug: 158059172
Test: m
Change-Id: Icd307ac5f9b522dfc469b07fc86154eecf6cecb9
diff --git a/packages/SettingsLib/HelpUtils/Android.bp b/packages/SettingsLib/HelpUtils/Android.bp
index 5826047..aea51b1 100644
--- a/packages/SettingsLib/HelpUtils/Android.bp
+++ b/packages/SettingsLib/HelpUtils/Android.bp
@@ -19,4 +19,8 @@
 
     sdk_version: "system_current",
     min_sdk_version: "21",
+    apex_available: [
+        "//apex_available:platform",
+        "com.android.permission",
+    ],
 }