.alert() is meant to be generic, but there is currently no way
for the device driver to know which protocol generated the alert.
Add a parameter in .alert() to help the device driver to understand
what is given in data.

This patch is required to have the support of SMBus Host Notify protocol
through .alert().
Tested-by: NAndrew Duggan <aduggan@synaptics.com>
For hwmon:
Acked-by: NGuenter Roeck <linux@roeck-us.net>
For IPMI:
Acked-by: NCorey Minyard <cminyard@mvista.com>
Signed-off-by: NBenjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>