Add support of dislaying Alpha tag for BIP commands

While BIP data call setup is still handled in RIL/Modem,
this patch is adding support of Alpha tag display on UI.
Alpha tag is optionally included in "OPEN Channel", "Close Channel",
"Send Data" or "Receive Data" command.

"Open channel" will be notified via RIL_UNSOL_STK_PROACTIVE_COMMAND
which requires TERMINAL RESPONSE based on user input.
"Close channel", "Send Data" and "Receive Data" commands
are send via RIL_UNSOL_STK_EVENT_NOTIFY just to display
transient notice.

Bug:5165510
Change-Id: I873e55274c860886bc816ce6fb07cb882d339214