Revert "remove vp8 unused uvstride parm in simple loop filter"

This reverts commit 392a2c43c77242f05715bdac086f235e6cbbdf2e

Failing nexus build tests:
http://build.chromium.org/p/client.libvpx/builders/Nexus%207%20Builder/builds/224

Change-Id: I95ae2c894b70cef9c757334fcab7fdeca9003e9c