hwmon: Remove pkgtemp driver

After the merge of pkgtemp functionality into the coretemp driver,
the pkgtemp driver is no longer necessary. Remove it.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Acked-by: Jean Delvare <khali@linux-fr.org>