Rosenzweig: Conformant open source support for Mali-G57

Alyssa Rosenzweig announcesa milestone for support of Mali GPUs with free software:

The open source Panfrost driver for Mali GPUs now supports the newValhall architecture with fully-conformant OpenGL ES 3.1 onMali-G57, a Valhall GPU. The final Mesa patches are landing today,and the required kernel patches are queued for merge upstream.