This patch creates and exports 2 functions which can be used by the rest of
kernel code to perform DMI data checks:

- dmi_check_system() function checks system DMI data against given blacklist
  table and on each match runs corresponding callback function;

- dmi_get_system_info() function returns DMI data value.  Useful for people
  wanting more complex DMI data check than simple string match.

Also filling unused match entries with NO_MATCH made optional, but existing
NO_MATCH occurences are left intact, so people are free to continue dmi_scan.c
patching without massive reject problems.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>