DO NOT MERGE | libvpx: Fix OOB caused by odd frame width.

Keep behaviors unchanged without external allocation.

Bug: b/64710201
Test: poc provided in the bug.

Change-Id: I319a47b64c7cfa7bb47ad01c702be6f2acffe3a4
(cherry picked from commit 51721c34847e6b4f935d5ecb1b44931c7716fd59)
(cherry picked from commit 28a641201287106fbb73dfbad35dae2756cde265)
