Add needsOtaServiceProvisioning to Phone.

By having needsOtaServiceProvisioning supported on all phones we
eliminate the need to use an if statement to discriminate phone type.
Types of phones that don't support OTASP will return false in the
default implementation in PhoneBase.

Change-Id: I8fb15a18553e314c1f8f2a00ec7f8cffd79eeb7f