Currently STA/GC connection will have JOIN which actively probe AP/GO
in this state to get latest bss entry, but before connection scan
already trigger and bss entry updated in scan db so can skip JOIN
in some scenario.
There is requirement to optimize GC connection speed, and to skip
JOIN state is one of the subtask to achieve it. Add a build option
to skip JOIN for GC connection.
Change-Id: I1f8beaa41ea398601a17fa80997029b8ac8849ae
CRs-Fixed: 3598283
a4715adff4