Wi-Fi: Fix for SoftAP turn ON/OFF fails issue.

Turnig ON/OFF SAP repeatedly when WIFI is ON results in to command
CMD_SET_AP being received in WifiStaEnabledState of the state machine,
which will not be handled and because of this SoftAP is not turned ON and we
receive no events thus the check box remains greyed out/disabled.
To resolve this wait for WIFI_STATE_CHANGED intent before
re-enabling the SAP.

Change-Id: Ifc330309c7919f2efc2916573353d0764b5e1f9e