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Migrate to using the PhoneSwitcher Handler for SubscriptionChanged
Move off the extra handler onto the main handler for the OnSubscriptionsChangedListener to avoid using the internal method and support lazy initialization of the OnSubscriptionsChangedListener. Bug: 278814050 Test: atest FrameworksTelephonyTests Change-Id: I909a1d93dcb69de405f41c5e42a0f78032e08d9d