diag: Perform member-wise copy instead of memcpy

Diag driver was copying the information from early initialization
information for forward channels onto the control channel objects.
This patch does a member-wise copy of the channel objects.

Change-Id: Iaf2f1e4ddb392e1f2ee65a8796e91e4831cf8974
Signed-off-by: Ravi Aravamudhan <aravamud@codeaurora.org>