MSIM(DSDA): Use new methods in accordance with new design

1. Delete setActiveSubRetainLch and
2. Use setActiveAndConversationSub when both active sub & Conversation
Subscription to be set, for example when user switching sub explicitly.
3. Call setActiveSubscription only for MSIM.

Conflicts:
	src/com/android/incallui/CallCommandClient.java

Change-Id: I1ef194cfbf717bbaea1b66d5c95c3b845dfaa21d
CRs-Fixed: 659123
InCallUI CMCC: disable volume boost by default

The volume boost button in the InCall UI attempts to boost the volume
by setting parameters on the AudioManager.  This only works if there
is hardware support for the volume_boost=on parameter.  If enabling
volume boost with setParameters doesn't work, then getParameters will
not surface the parameter, which creates a confusing user experience
because we will report "volume boost disabled" whenever the user presses
the button (when the expected behavior is to toggle it).

This should really only be enabled if it is supported, so this disables
it by default.

Change-Id: I0b0458f63a9d1524c887c5a8d45cff937aceacf1