Merge "storageproxyd: Start only a single binder thread" into main am: e4cbd9a6a0

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2670162

Change-Id: Icea468282ec0e808c1eff5c0951e302f1c598843
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>