hardware: libhardware: Power HAL add power hints -- DO NOT MERGE

Change-Id: I8ab0376e4f5d8ef09d5b1062cbfbb30c30c5bb96
Signed-off-by: Todd Poynor <toddpoynor@google.com>
diff --git a/modules/power/power.c b/modules/power/power.c
index ef3fe94..7d8c112 100644
--- a/modules/power/power.c
+++ b/modules/power/power.c
@@ -59,6 +59,13 @@
     }
 }
 
+static void power_hint(struct power_module *module, power_hint_t hint,
+                       void *data) {
+    switch (hint) {
+    default:
+        break;
+    }
+}
 
 static struct hw_module_methods_t power_module_methods = {
     .open = NULL,
@@ -77,4 +84,5 @@
 
     .init = power_init,
     .setInteractive = power_set_interactive,
+    .powerHint = power_hint,
 };