UPSTREAM: ath10k: add QMI message handshake for wcn3990 client

Add WCN3990 QMI client handshakes for Q6 integrated WLAN connectivity
subsystem. This layer is responsible for communicating qmi control
messages to wifi fw QMI service using QMI messaging protocol.

Qualcomm MSM Interface(QMI) is a messaging format used to communicate
between components running between remote processors with underlying
transport layer based on integrated chipset(shared memory) or
discrete chipset(PCI/USB/SDIO/UART).

Change-Id: Ib8f17733ce5012db70a6165ee503bf5f5d1dab82
Signed-off-by: Govind Singh <govinds@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Niklas Cassel <niklas.cassel@linaro.org>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Git-commit: ba94c753ccb471bafe8bd824b744fda6fee0001e
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git


Signed-off-by: Govind Singh <govinds@codeaurora.org>