Refactor PickerSyncController methods

Update PickerSyncController#syncPicker to  PickerSyncController#syncAllMedia

Bug: b/217351337
Test: atest com.android.providers.media.photopicker.PickerSyncControllerTest

Change-Id: Id1112075acaff7ff4dbb0f76b776450997a62bba
5 files changed