lima: mythtv rendering on mali450 hw gles surface broken when text on surface is rendered

Current mesa (3c1a24de) on mali450 hw (amlogic s905) under mythtv gles rendering has render issue when playback uses on-screen text rendering. When text is rendered - picture becomes distorted. Turning off text rendering makes playback ok - so it look like issue is when myth uses gles api to draw text on gles surface. the same code works ok on vc4. apitrace to playback this issue is here: trace file