scsi: reduce the informational log messages during initial probe

There are many informational log messages printed during the LUN detection
and while binding the scsi device with upper level driver. Most of these
messages are KERN_NOTICE level and hence would show up on serial console.
In fact, as we are using the dev_printk() APIs even KERN_DEBUG level
messages are ending up on console. This patch removes most of these
informational log messages to reduce the load on serial console during
boot up.

Change-Id: I332b71f529e04039645d1f41783395da8abc7f0b
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>