common: Fix unintialized reads in intra pred sse functions

Bug: 144686961
Bug: 137565646
Bug: 137228292
Test: poc in bug
Change-Id: I2830a30230cf566b17dca77a68136c9c4bd82215
(cherry picked from commit 406fb2aa0e31a365ad10c2ef32df365211fa4687)
2 files changed