Add CPUCP fast device tree entry to get mailbox channel id and cpus to
be controlled with fast.
Signed-off-by: Lingutla Chandrasekhar <quic_lingutla@quicinc.com>
Signed-off-by: Bruce Levy <quic_blevy@quicinc.com>
Change-Id: I0f0f0a6a13add9f303d13631a90e7c1b4aa558f7