Special case Tachyon mimetype

With no contacts.xml, we need to skip the AccountType verification
for the mimetype. If we find a dataItem with the mimetype, we can
fill in the necessary items and avoid checking/adding the DataKind.

Test: Manually verified video icons were visible and were actionable

Bug: 36874501
Change-Id: I5de032a50925d73950c0e7e347d48202fe3f58ac