If rild is reset while RIL_DEACTIVATE_DATA_CALL is pending
response, the ApnContext is not force cleaned up since
link to DCAC is cleared in the begining of release.
This patch fixes:
1) Hold DCAC reference until the DC is disconnected. This is
to ensure DC won't be stuck in DcDisconnectingState so force
reset can kick in.
2) In "clearCleanUpConnection", make sure the status of ApnContext
can be reset to IDLE even if no reference to DCAC.
Change-Id: Ic69271da7c6bc9dcb2c38ec53a9bd2e8ce785adc
77c9411306