Load default data subid on create

PhoneGlobals sometimes is created later than DefaultDataSubscription
Changed Intent. At this time, there is no logic to load the initial
value, so modified it to load the initial value so that it does not
remain as INVALID.

Bug: 297319589
Test: manual bootup and verify
Change-Id: I0aa9ec497014ae1e4af55eca41e6df681cce6541
1 file changed