linux-firmware: add APIv2 AP firmware for marvell 8388

APIv2 adds the following enhancements:

-- capabilities are reported by the firmware
-- API supports up to 8 dedicated AMPDU streams
-- optional packet timestamping and expiration can be enabled.
   Specifically, packets that are queued in firmware for longer
   than 500ms will be dropped if this option is used.

Signed-off-by: Brian Cavagnolo <brian@cozybit.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>