Staging: otus : checkpatch.pl cleanup for header files

Fix for checkpatch.pl errors and warnings in header files of otus driver.
(There is a typedef which still remains. Plan to clean it up in next set
of patches)

Signed-off-by: Mithlesh Thukral <mithlesh@linsyssoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>