power: Clean up and fix set_interactive_override

* Remove debug logs and useless comments
* Consistent return values
* Check if set_interactive_override handled hints and print
  info message if it didn't

Change-Id: Iff9f7327ba71c282e34ff3143c45a3f40f72fc92

power-8998.c

@@ -198,7 +198,3 @@ int power_hint_override(power_hint_t hint, void* data) {
     }
     return ret_val;
 }
-
-int set_interactive_override(int on) {
-    return HINT_HANDLED; /* Don't excecute this code path, not in use */
-}