Add RIL_REQUEST_SEPARATE_CONNECTION and fix bugs

. Fix connection indexing: limit the connection index to [1, 7]
. Fix conference call: the maximum number of connections within a call is 5.

Change-Id: I261454c5c37b544da3f3d29f96f3f69a11b2a969
10 files changed
tree: 1b52c2c7891906a3f75e86107c8eee939abc294c
  1. include/
  2. libril/
  3. mock-ril/
  4. reference-ril/
  5. rild/
  6. CleanSpec.mk