overlay: Change in-call volume to 7 level

Modify Voice call max volume default value to 7 same as Pixel

Port to Android 11: Use Android property rather than patching
frameworks/base.

Issue: PRJ8901-1794
Change-Id: I19dba65cc76f6c57c521a2cecdca6294011fce47
(cherry picked from commit frameworks/base/775b490d90de9684d20f33985faf1b22f69f7d36)
1 file changed