diag: Consider delayed responses while recording packet statistics

Diag driver was ignoring delayed response type packets while
recording packet allocation and drop statistics which results in
erroneous prints. This patch solves this issue.

Change-Id: I299f341a91c027c7cc5ee185b854ca5ad1bcc114
Signed-off-by: Ravi Aravamudhan <aravamud@codeaurora.org>