Telephony: Fix for dial request when there is already an active call.

- When user has one active call & tries to place second call,
the active call should be put on hold first & after
receiving hold response, the dial request should be placed
for second call.

Change-Id: I0ab70e058d7029d9f8e0d8909238c83fe9068099
CRs-Fixed: 244097 549443