Added a new "wellbeing" protection flag.

Permissions that have the new wellbeing protection flag will be granted
to the wellbeing app, as defined by the OEM in the system resource.

The ACCESS_INSTANT_APPS permission is updated to use the wellbeing
flag. The SUSPEND_APPS permission will also follow the same model now.

Bug: 119330345
Test: atest CtsPermission2TestCases:PermissionPolicyTest
Test: atest com.android.server.pm.SuspendPackagesTest
Test: atest com.google.android.suspendapps.permissionpolicy.gts.SuspendAppsPermissionPolicyTest
Change-Id: Iffedc7704824292be48a4ef198fff97c1e5c39da