powerhint: add game mode tuning nodes

Add down_rate_limit_us nodes, tapered_dvfs_headroom nodes.

Test: build
Bug: 295636226
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:33cd1ee8f025122df92662aceef76d55677f02a6)
Merged-In: I6b200ac6d41e06f445a97583fc189ace924f1fa6
Change-Id: I6b200ac6d41e06f445a97583fc189ace924f1fa6
1 file changed