scsi: sd: reduce log level for suspend/resume log messages

Generally driver should be silent during the normal operation of the device
hence this change reduces the logs level for suspend/resume messages from
KERN_NOTICE to KERN_DEBUG.

Change-Id: I154fb7c759aa35ed32ea451729083c93fc385c11
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
[mattw@codeaurora.org: resolved trivial context conflicts]
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>
[venkatg@codeaurora.org: resolved trivial merge conflicts]
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>