msm: scm-pas: Remove cpu_is_* checks

The soc type check is included in scm_pas_init in order to assign
different source port IDs to the bus bandwidth voting vectors.
The check is removed by making scm_pas_init a function to which
the source port ID is passed in as a parameter. This change assumes
that the destination port remains the same across all SOCs. The
scm_pas_init function is invoked from individual pil drivers.

Change-Id: I7472d07ae560a16d2fd03b184e340e56a62985d2
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>