powerpc/powernv: Remove dead SCOM access code

Nothing is using scom_map_device() or scom_find_parent(). Remove them.

Also don't export scom_controller, there are no other users of it.

Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190509051119.7694-2-ajd@linux.ibm.com