Bluetooth: qca: simplify WCN399x NVM loading

Bluetooth: qca: simplify WCN399x NVM loading

[ Upstream commit 1cc41b5092e3aa511454ec882c525af311bee631 ]

The WCN399x code has two separate cases for loading the NVM data. In
preparation to adding support for WCN3950, which also requires similar
quirk, split the "variant" to be specified explicitly and merge two
snprintfs into a single one.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>