qcacmn: Add revised extscan start hotlist monitor API

There is an existing WMI command which is used to start the extscan
hotlist monitor, wmi_unified_get_buf_extscan_hotlist_cmd(), but this
API has multiple issues:
1) The "get_buf" in the name implies it retrieves something, but it
   doesn't.
2) The full name is not a "mirror" of the companion function that
   stops the monitor, wmi_unified_extscan_stop_hotlist_monitor_cmd().
3) The current function has an "int *buf_len" parameter that is unused.

To address these issue introduce a new function with "mirror" naming,
wmi_unified_extscan_start_hotlist_monitor_cmd(), which has an
appropriate parameter list.

It is expected that all clients of the existing API will be moved to
the new API, at which point the existing API can be removed.

Change-Id: Ie705f2462c7d5befa691f1ab57293e55ab68e3e2
CRs-Fixed: 2289368
2 files changed