add constant defines - preparatory patch

- adds #define CONSTs  for max-pin,  gpio-addr-range (for reserving region)
- fix wrong max-pin check in gpio_open()
- add 'Winbond' to module description.  NSC sold the product, Winbond
  has supported us / lm-sensors
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>