freedreno/a6xx: Turn on copy_image and gles32
Fix the remaining format related sharp edges that deqp was complaining about, and flip cap.
It adds a fair bit of time to deqp-gles31 CI job, due to vastly increasing the # of tests run.. but we still seem to be squeaking in under the 10min mark.
PS. please don't ever use EXT_copy_image and friends.. it's a trap!