Support preload of location/media system libs

These libraries are loaded in ~10% of cold process starts, and
preloading yields modest improvements to both app startup latency
and memory, particularly for lower-end devices.

Add support for preloading these libraries behind a new flag:
  com.android.internal.os.enable_media_and_location_preload

Bug: 241474956
Test: m + ART benchmark service
Test: atest FrameworksCoreTests:android.app.ApplicationLoadersTest
Test: abtd + boottime_test_atrace_debug + boot trace inspection
Flag: com.android.internal.os.enable_media_and_location_preload
Change-Id: Ie75aa0d38555b6e5b71be9d535d58fe328c55893