Revert "gralloc: Align NV21 to 32 pixels"

This reverts commit a29cb492524c4e8362197d6ae062b2ac75e2e5d6.

Revert "gralloc: Fix NV12 and NV21 stride"

This reverts commit 9a5c21236bebcb4b3e860fc27f039e6dab3fc5ba.

Change-Id: Ice081bb54f7f31d457f0ea32c1aa8c75ed5e9b9c