panfrost: Advertise ES3.0 on Bifrost

Doing so fixes our remaining dEQP-GLES2 failures.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Tested-by: Maciej Matuszczyk <maccraft123mc@gmail.com>
Part-of: <!8427>
75 jobs for !8427 with gles3-7 in 14 minutes and 37 seconds (queued for 3 seconds)
merge request