commit 62d4263c7352c1643fd2c073989cb6cf816ebe10
author chen xu <fionaxu@google.com> Tue Apr 16 20:58:55 2019 -0700
committer chen xu <fionaxu@google.com> Wed Apr 17 11:55:32 2019 -0700
tree 0d171a2a369523cc2d0f042ddd856df0bce8af68
parent 2fde7b70c3cde142bf605bf1e79fe013e12fdc2a

increase callforward notification importance to shown in status bar

Form Q forward all low importance notification will be hidden from
status bar by default. callforward notification should be seen in
the status bar, thus create a new channel with default importance,
migrate settings from old channel to new channel and deprecate old
notification channel.

Bug: 130523298
Test: Manual test upgrade from P to Q
Merged-In: I26ad1539ec6e2b76c03e76213e221a1d1daa7178
Change-Id: I26ad1539ec6e2b76c03e76213e221a1d1daa7178
(cherry picked from commit 29a382c6ce05169da0671cd4ac2c97b4821fee7c)