BACKPORT: UPSTREAM: ath10k: Add WMI diag fw logging support for WCN3990

Integrated WiFi chipset ex:WCN399x supports fw logging
using WMI copy engine and shared mem DIAG based fw logging.
By default shared mem DIAG based fw logging is enabled.
To support WMI copy engine based fw logging add QMI
control message to enable WMI copy engine based fw logging.

Enable WMI based fw logging using fw_diag_log module parameter.

insmod ath10k_core.ko fw_diag_log=1

DIAG utility(https://github.com/andersson/diag

) implements extraction
of diagnostics related messages between application processor and
various subsystems while shared mem DIAG based fw logging is enabled.

Testing: Tested on WCN3990/QCA6174 HW.
Tested FW: WLAN.HL.3.1-00959-QCAHLSWMTPLZ-1.

Signed-off-by: Govind Singh <govinds@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
[govinds@codeaurora.org: fix trivial merge conflicts]
Change-Id: I975844da5efc8aad78684298f6a6188934547758
Git-commit: d9e47698965d782dba1d9d9bc04441e668d71008
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git


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