frameworks: fix setting up linked notification stream on boot

updateStreamVolumeAlias() was previously responsible for checking the
linked notification variable and mapping the notification stream, but
the setting to read whether the notifications were linked was read in
after that method had run which was responsible for linking them.
Extract the logic and re-run it again after reading the persisted
settings.

Change-Id: Ia62bf3ca072def54ec6ebf4f9e865d9c913e3bc4
Signed-off-by: Roman Birg <roman@cyngn.com>