Use ALLOCATOR_SOFTWARE with ImageDecoder

Bug: 119510493
Test: atest FrameworksCoreTests:android.content.ContentResolverTest

An app may want to draw this thumbnail to a software canvas, so use the
software allocator to support that.

Change-Id: Ib789e0bf98c3638c61c43fe6cd7d504cdfe02ced
2 files changed