Bluetooth: qca: fix NVM configuration parsing

The NVM configuration files used by WCN3988 and WCN3990/1/8 have two
sets of configuration tags that are enclosed by a type-length header of
type four which the current parser fails to account for.

Instead the driver happily parses random data as if it were valid tags,
something which can lead to the configuration data being corrupted if it
ever encounters the words 0x0011 or 0x001b.

As is clear from commit b6388254 ("Bluetooth: btqca: Fix the NVM
baudrate tag offcet for wcn3991") the intention has always been to
process the configuration data also for WCN3991 and WCN3998 which
encodes the baud rate at a different offset.

Fix the parser so that it can handle the WCN3xxx configuration files,
which has an enclosing type-length header of type four and two sets of
TLV tags enclosed by a type-length header of type two and three,
respectively.

Note that only the first set, which contains the tags the driver is
currently looking for, will be parsed for now.

With the parser fixed, the software in-band sleep bit will now be set
for WCN3991 and WCN3998 (as it is for later controllers) and the default
baud rate 3200000 may be updated by the driver also for WCN3xxx
controllers.

Notably the deep-sleep feature bit is already set by default in all
configuration files in linux-firmware.

Fixes: 4219d468

 ("Bluetooth: btqca: Add wcn3990 firmware download support.")
Cc: stable@vger.kernel.org	# 4.19
Cc: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>