linux-firmware: Add firmware for mwl8k 8764 chip

The new firmware version is 7.4.0.9, API is 1.
Signed-off-by: Nishant Sarmukadam <nishants@marvell.com>
Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

WHENCE

@@ -707,6 +707,9 @@ File: mwl8k/fmimage_8366_ap-3.fw
 Version: 5.2.8.16
 File: mwl8k/helper_8366.fw
 
+File: mwl8k/fmimage_8764_ap-1.fw
+Version: 7.4.0.9
+
 Licence: Redistributable. See LICENCE.Marvell for details.  8687 images
 downloaded from Marvell's "Extranet" with permission.  8366 images contributed
 directly by Marvell.