linux-firmware: qca99x0 update package

Kalle Valo ath10k-firmware repository no longer provides the
legacy board.bin files for the qca99x0 chips. Instead he
copied over the codeaurora version and add more board files.

In the future, this board-2.bin should find its way to
linux-firmware.git, which would allow us to remove the
extra download code completely.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>