mrvl: add firmware for Prestera ASIC devices

The firmware supports only boards designed for the Marvell Switchdev
solution.
Signed-off-by: Mickey Rachamim <mickeyr@marvell.com>
Signed-off-by: Vadym Kochan <vadym.kochan@plvision.eu>

WHENCE

@@ -5032,3 +5032,11 @@ Derived from proprietary unpublished source code.
 Permission is hereby granted for the distribution of this firmware
 as part of Linux or other Open Source operating system kernel,
 provided this copyright notice is accompanying it.
+
+------------------------------------------------
+
+Driver: prestera - Marvell driver for Prestera family ASIC devices
+
+File: mrvl/prestera/mvsw_prestera_fw-v2.0.img
+
+Licence: Redistributable. See LICENCE.Marvell for details.