msm: buspm: Add RPM-SMD support for SPDM clocks to buspm module

For bus-profiling, SPDM clocks need to be enabled/disabled from
user-space. This can be done by sending requests through the
buspm IOCTL interface. This patch adds support to send the
SPDM requests to RPM and enables bus profiling on 8974.

Change-Id: Ic9ff04c0de2fb15513156176ad113ca5624e2f25
Signed-off-by: Gagan Mac <gmac@codeaurora.org>