Telephony: Add data rat constant

This event constant is used in DcTracker

Change-Id: I1f9b34a8689c43c2586e9e3a92f0453649775d73
(cherry picked from commit f7ca98035479b670ff51bc9298fd7928a5e0f80d)
(cherry picked from commit f4d8f7b8fa390302b9cc51a5640e017ff393dfcc)
(cherry picked from commit 77d810390fbca8cb1d10bce148035fada414e0eb)
(cherry picked from commit 3b4712dc8ac7dff360222e8cf43dde633333ffa5)

Change-Id: I7ad8d0632854ea9875afb76709c1ba894bf048fd
Enable SVDO. (2/2)

Allow evdo/ehrpd + voice simutaneously.
Use ro.ril.svdo=true

Change-Id: Ifcefd1ee49c5137209b776b00ae8e189dc618247
(cherry picked from commit 3e835c216588ae44a7099113f95118e9a3a23c15)

Change-Id: If7be25edc10f21680adbe3a059370d77a82ef076
Merge "Telephony: Add data rat constant" into android-4.4
Merge remote-tracking branch 'cm/android-4.4' into android-4.4