qcacld-3.0: Refactor WE_SET_SCAN_DISABLE ioctl processing

One of the HDD functions with the highest cyclomatic complexity is
__iw_setint_getnone(). In order to reduce the complexity there is a
plan to replace the existing switch with a vtable. As part of that
goal refactor the WE_SET_SCAN_DISABLE ioctl handling into a separate
function.

Change-Id: I412098141c3d4664c24ef40d10d0372051b19b6b
CRs-Fixed: 2350068
1 file changed