SF: fix binder thread priority

Add setMinSchedulerPolicy to all binder interfaces SF exposes.
It was missing from gui::ISurfaceComposer and
gui::IDisplayEventConnection.

Test: presubmit
Bug: 299378819
Bug: 313924033
(cherry picked from commit 07d03c4d260b804c07f7ac927515b26c84c9a4ea)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:01759208ae46249f5b0a11802af03731f375de95)
Merged-In: Ia0d99efa5a3bc58625c320d4df3c08bb597d2e38
Change-Id: Ia0d99efa5a3bc58625c320d4df3c08bb597d2e38