This patch does the following:
  - it adds a new header for sysfs
  - it changes zio-sys.c to support per-instance trig/buf attributes
  - it renames some functions
  - is simplifies sysfs handling

Signed-off-by: Federico Vaga <federico.vaga@gmail.com>
Acked-by: Alessandro Rubini <rubini@gnudd.com>