media: check decoder support for thumbnail dimensions

Allow thumbnails to be decoded if a decoder supports the
thumbnail resolution but does not support the full image
resolution.

bug: 204349132
test: android.media.cts.ThumbnailUtilsTest

Signed-off-by: Derek Smith <derek.smith@broadcom.com>
Change-Id: I748509dca03afdb1a93852025d0be30b8df641ed