msm: smd: skip printing stats for restricted edges.

Non-APSS owned edges involving the RPM processor are restricted and if
accessed, will cause a memory protection fault.

Skip printing statistics for channels that involved restricted edges.

Change-Id: I25531b8c23817fdda9b8c642f9d877dc190b0ecb
Signed-off-by: Eric Holmberg <eholmber@codeaurora.org>