freedreno/a4xx: enable A405
This patch brings support for Adreno A405 as found on MSM8939. That chip is a cut-down version of A4XX IP and requires no special handling.
Tested on Asus Zenfone 2 Laser (Z00T) smartphone.
Signed-off-by: Konrad Dybcio konradybcio@gmail.com