diag: Command registration does not happen properly

Some CM command registrations do not happen properly
on apps side. This is due to some smd events miss
for control type. Make changes in order to read pending
SMD packets for control type.

Change-Id: I0fe25455275f6169bee91d151d8657330081c104
CRs-Fixed: 516718
Signed-off-by: Mohit Aggarwal <maggarwa@codeaurora.org>