RIL: Make RIL subclassable

Change-Id: I9144ef279ca9c8cb9e657a28342f0f4cb3e7debd
telephony: Use reflection to create command interface (RIL class)

Change-Id: Icdc02eaa74b89dbde4ddfb989cc62481d6423312
Allow a device to include its own RIL subclass

For cases where a single device needs a subclass, there's no need to
pollute the common core with it: just stick it in the device's own
repository, and add something like
"BOARD_RIL_CLASS := ../../../device/manuf/model/ril/" to the BoardConfig

Change-Id: I9d01ceb6e5587382eb216341e2e373ec0c52848f
Initialize RIL with the correct CDMA subscription mode setting

Users choice of CDMA Subscription Source is stored in CDMA_SUBSCRIPTION_MODE
setting in database.
If telephony restarts after a crash, PhoneFactory sets the
CDMA subscription source value from PREFERRED_CDMA_SUBSCRIPTION
setting and that causes the mismatch with the value in the settings
database chosen by the user. The change is to use the
CDMA_SUBSCRIPTION_MODE setting instead when creating the RIL object.

Also, remove the Setting PREFERRED_CDMA_SUBSCRIPTION from the database.
With this change the special treatment for LTE on CDMA will not be needed.
The correct value can be set in the database for CDMA_SUBSCRIPTION_MODE
and that will be taken on power-up by this code.

Change-Id: I11fff596a5fe721c64f192c889672326517dc43d
Telephony: Look for CSS indicator for voice+data

For non-LTE, use the CSS field of VOICE_REGISTRATION_STATE to determine
if the modem supports simultaneous voice+data.

Change-Id: I546c939f325a6e3b09d563e32d45412910401422
Telephony: Support for LTE network modes

Change-Id: I8833fe3e56c94303f05111a94433b1b9e6568d2f
Telephony: Add getLteOnGsmMode() method (2/2)

Same functionality as the existing getLteOnCdmaMode, but for GSM
LTE devices.
Enable with the telephony.lteOnGsmDevice system property

From CM 10.0: Ibfb47ca608e51393b99d3308e0a6c66050b3f32e
- Moved getLteOnGsmModeStatic() to TelephonyManager.