msm: scm-pas: Update bandwidth voting to support msm8974

The crypto engine used by the secure context lives behind a different
bus port than on previous targets. Update the bus bandwidth endpoints
accordingly. Clock APIs don't need to be called on a "bus_clk" for
8974 either, since the bus driver is responsible for all clocks on
the path from memory to the crypto core.

Change-Id: I91df9f2d4db77ade8b5a9c86e811cfd026b20af2
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>