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

Signed-off-by: artas182x <artas182x@gmail.com>
RIL: Make RIL subclassable

Change-Id: I9144ef279ca9c8cb9e657a28342f0f4cb3e7debd

Conflicts:
	src/java/com/android/internal/telephony/RIL.java

Signed-off-by: artas182x <artas182x@gmail.com>