mwl8335: add duplex firmware for 88w8335 PCI-based parts

Firmware is "duplex" which means it is capable of both STA and AP
modes.  See the GPL reference driver here for more details on how
to talk to the chip:

http://www.seagate.com/staticfiles/maxtor/en_us/downloads/MSSII_3.1.2.src.tgz

Signed-off-by: Dan Williams <dcbw@redhat.com>

LICENCE.mwl8335

+FIRMWARE LICENSE TERMS
+
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+Copyright (c) Marvell International Ltd.
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+All rights reserved.
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+Redistribution. Redistribution and use in binary form, without modification, are
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+* Neither the name of Marvell International Ltd. nor the names of its suppliers
+may be used to endorse or promote products derived from this software without
+specific prior written permission.
+
+* No reverse engineering, decompilation, or disassembly of this software is
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+
+----
+
+NOTE: this firmware was generated from img_cb35_fw_duplex.h contained in the
+GPL source release of the Maxtor Shared Storage II product available here:
+
+http://www.seagate.com/staticfiles/maxtor/en_us/downloads/MSSII_3.1.2.src.tgz
+
+Explicit permission from Marvell was obtained to upload this firmware to the
+linux-firmware git repository under the Marvell firmware license above.
+