Add contexts for sqlite debug properties

These are read by some apps, but don't have any corresponding property
contexts. This adds a new context as we're going to remove default_prop
access.

Bug: 173360450
Test: no sepolicy denials
Change-Id: I9be28d8e641eb6380d080150bee785a3cc304ef4
diff --git a/private/app.te b/private/app.te
index ab9cf3c..dacea29 100644
--- a/private/app.te
+++ b/private/app.te
@@ -59,3 +59,6 @@
 
 # Allow to read persist.config.calibration_fac
 get_prop(appdomain, camera_calibration_prop)
+
+# Allow to read db.log.detailed, db.log.slow_query_threshold*
+get_prop(appdomain, sqlite_log_prop)