qcacld-3.0: Refactor WE_CLEAR_STATS processing

One of the HDD functions with the highest cyclomatic complexity is
__iw_setint_getnone(). The handing of WE_CLEAR_STATS has a complexity
greater than 1, so refactor that logic into a separate function to
help reduce the complexity of __iw_setint_getnone().

Change-Id: I51e72ccf83a6b63792c17d6c65daca6571ef21bb
CRs-Fixed: 2341122
1 file changed