Use hwservicemanager getTransport.

libhidl no longer provides a getTransport function. Now, call into the
hwservicemanager which directly interfaces with libvintf.

Test: extensive, see Ia5d1eb41b057ab5d6800f6c3fd22658adecc4be7
Bug: 36377072

Merged-In: I8b0ca845251cd7cd156f3471cbd4b0ce17617be0
Change-Id: I8b0ca845251cd7cd156f3471cbd4b0ce17617be0
(cherry picked from commit f8202e46)