gl-renderer: correct texture format chose for shm attach when GLES 2.0

GLES 2.0 don't support GL_R8 GL_RG8 as internal format

Signed-off-by: Haihua Hu <jared.hu@nxp.com>
4 jobs for master in 6 minutes and 33 seconds (queued for 1 second)
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  Container Prep
passed #570558
container_prep

00:04:34

 
  Build
passed #570559
build-native-meson

00:01:29

 
  Pages
passed #570560
pages

00:00:29

 
  Deploy
passed pages:deploy

00:00:05