Removed tCreate and tAssociate from MsgTask. LocThread
now can optionally take a tCreate method. Associator is
replaced with *firstMsg* option to MsgTask, which is a
more generic option, that can associate or do other set
up job at the create of a MsgTask.
The current MsgTask doesn't use tCreate, which exposes
a slight time window for Location HAL when its MsgTask
is NOT associated to DVM heap but a message delivery to
DVM could be attempted during this time.
Change-Id: Iafd5b91b693baacb9b7064463f8c44f74026f54c
CRs-Fixed: 902350
