Avoid duplicate ringtone load

When we create the ringtone defer creating the mediaplayer
until AudioAttributes are set, this avoids a duplicate
creation of the mediaplayer which causes a duplicate
asset load for the ringtone.

Bug: 240621827
Test: Receive a call and hear ringtone

Change-Id: Ic36412759bd17e63857182435c02c44b535f3210
1 file changed