egl/surfaceless: print out a message on zero configs for given format

egl/surfaceless: print out a message on zero configs for given format

Currently we print a debug message if the total configs is non-zero only
to do the same (at an error level) as we return from the function.

Rework the message to print if we're missing a config for the given
format.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Eric Engestrom <eric@engestrom.ch>