CEC: Make deviceSelect work for MHL device

MHL device works on hotplug but not when API deviceSelect is invoked
to select it due to a bug not finding the right MHL device instance.
This CL rectifies it by searching for not only CEC but MHL devices
attached to TV.

Bug: 18909552
Change-Id: I4df1ead836090eb3a7476b7738be47a6970edb7d