hwmon: Kconfig dependency cleanups

* Drop HWMON from the dependency list of ABITUGURU3 and LM93: this is
  now handled at menu level.
* Make the Abit, Asus and FSC chip drivers depend on X86. These are
  custom chips which can only be found on their respective manufacturer's
  systems, and these manufacturers only do x86 hardware AFAIK.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Hans de Goede <j.w.r.degoede@hhs.nl>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>