edac: Allow the option of creating a deferrable work for polling

EDAC provides a mechanism to poll for errors using a callback function
and uses a delayed timer to schedule it. Provide an option to create
a deferrable timer if the error checking is not worth waking up
the cpu from idle

Change-Id: Ia25216323eabf7fa4b894897c950414006921f3f
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>
Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>