diag: Add Support to switch between real time modes

Adding support to switch mode of Diag on peripherals between
real time and non real time modes while using DCI/Memory Device.
Also added changes to record debug information related to
DCI in debugfs.

Change-Id: I8aecf63681094b2cd47759702f6cbb225afda40d
Signed-off-by: Ravi Aravamudhan <aravamud@codeaurora.org>