UPSTREAM: Bluetooth: hci_qca: Add support for Qualcomm Bluetooth SoC WCN3991

This patch add support for WCN3991 i.e. current values and fw download
support.

Signed-off-by: Balakrishna Godavarthi <bgodavar@codeaurora.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
(cherry picked from commit 7d250a062f75e6ee8368b64ac6ff1e09fbb6783d)
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: I46231dd50e394fdd8b0fdbdf42a74e070712798b