Use new ContactPhotoManager APIs for letter tile avatars

*Modify the following uses of ContactPhotoManager.loadPhoto in the following
classes to include a DefaultImageRequest, populated with the contact's
display name, lookupkey, and contact type as necessary

CallDetailActivity
CallLogAdapter
PhoneFavoriteTileView

*Add utility methods to ContactInfoHelper, to parse a lookupUri for a lookup
key, as well as determine whether or not a contact is a business contact,
from its sourceType field.
*Add a sourceType field to PhoneCallDetails which can be used to track
whether or not PhoneCallDetails belongs to a business contact
*Add a lookupKey field to ContactInfo

Bug: 13101785
Change-Id: If339a9c038f92a0212f8f8b45b5e3cc5f6442562