diag: Check for the peripheral limits for the pd

Check for the perpheral limits while fetching peripheral information
from the pd before sending the non real time mode control packet
to the peripheral.

Change-Id: Iad8b2d12f8f8e83342bf299cb43b5e5dbb12c608
Signed-off-by: Sreelakshmi Gownipalli <sgownipa@codeaurora.org>