Use sysfs control for storage device GC am: d96b2ac076

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/vold/+/18972074

Change-Id: I0e6b3725ebeb937a7046c492e4b699cfb2d24b37
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>