Add plumbing for ADPF Power Efficiency hint

These patches introduce a new power efficiency mode for hint sessions
to the public API, and internally expose a new setMode API for hint
sessions that resembles the setMode API for iPower, to control
different session operating modes.

This set of patches:
 - Updates the PowerHAL AIDL to version 5, and updates relevant bp files
 - Exposes new setPreferPowerEfficiency(bool enabled) method from the
 SDK and NDK
 - Exposes new setMode(int mode, bool enabled) method from PowerHAL AIDL
 and HintManagerService
 - Adds support for new setMode call in PowerHAL

Bug: b/288117936
Test: manual
Change-Id: Id006341b5ab0ae6fadd975d740d2fcf89f0636e4
diff --git a/power/aidl/default/PowerHintSession.cpp b/power/aidl/default/PowerHintSession.cpp
index f395800..452e435 100644
--- a/power/aidl/default/PowerHintSession.cpp
+++ b/power/aidl/default/PowerHintSession.cpp
@@ -59,4 +59,8 @@
     return ScopedAStatus::ok();
 }
 
+ScopedAStatus PowerHintSession::setMode(SessionMode /* mode */, bool /* enabled */) {
+    return ScopedAStatus::ok();
+}
+
 }  // namespace aidl::android::hardware::power::impl::example