qcacld-3.0: Refactor WE_SET_SHORT_GI processing

One of the HDD functions with the highest cyclomatic complexity is
__iw_setint_getnone(). The handing of WE_SET_SHORT_GI 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: Ica2a50216c413985f05a2771641be439c6c9d8cd
CRs-Fixed: 2339229
1 file changed