Fix issue #2262563: 40 ANR reports from com.android.settings in dogfooding sholes running ERD43

Don't hold the global package log while instantiated an AssetManager+Resources, since
this is a fairly heavy-weight operation, and if done in the background can starve the
foreground.

Change-Id: I5ad37324fb7c27ffdbf28e1498ca0ad667479580