Remove obtainStyledAttribute and AssetManager2::GetBag tracing
These traces are small and noisy, so they hurt performance more than they help.
This reverts commit c3745779.
Test: m
Bug: 132721345
Change-Id: I9ef719f54f2bc8a54f23e88f46d74e35417a6519
(cherry picked from commit 3509b624)