Mark EXTRA_INCOMING_NUMBER for PHONE_STATE broadcast as deprecated.

In Q we have introduced new APIs which replace the need for an app to
get the phone number for calls through the phone state broadcast.  As
such the EXTRA_INCOMING_NUMBER is being marked deprecated.  Developers
are encouraged to use the new replacement APIs instead.

Test: Make API / build
Fixes: 128835519
Change-Id: If1bc0076392281887f6cc8017788a07f170c7a17