wifi(implementation): Allow chip reconfiguration

This was previously disallowed because WifiLegacyHal.stop() was non blocking.
WifiLegacyHal.stop() was made blocking using ag/2715673, so reconfiguration
should be supportable now.
Note: This is a partial revert of ag/2125543.

Bug: 65671875
Bug: 70411703
Test: Will send for regression tests.
Test: Reverted the VTS CL: ag/2139830 and ensured that the test works
now. Can't check-in that revert because it would not be backward
compatible.
Change-Id: Ia5f9ccaf5403d171b0def7740d2adece7eb3c157