egl/android: Restrict minimum triple buffering for android color_buffers

egl/android: Restrict minimum triple buffering for android color_buffers

The patch restricts triple buffering as minimum at driver for android
color_buffers in order to fix onscreen performance hit for T-Rex and
Manhattan.

v2: Update min_buffer check condition (Tapani Pälli)
v3: further code cleanup (Eric Engestrom)

Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/2332
Fixes: 0661c357c60 ("egl/android: Update color_buffers querying for buffer age")
Signed-off-by: Nataraj Deshpande <nataraj.deshpande@intel.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3384>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3384>