Brad Ebinger a7df4c0be6 Remove "one shot" type of FeatureCallback
Instead of having a special case for ImsManager#getInstance,
implement it properly.

Test: atest CtsTelephonyTestCases

Merged-In: I2e986fb2a1086043a25b11c71c005481cea74196
Change-Id: I2e986fb2a1086043a25b11c71c005481cea74196
2020-10-05 11:04:40 -07:00
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