hpilo: Despecificate driver from iLO generation

This driver supports iLO, iLO2 and iLO3. However, comments and Kconfig
reference only iLO and iLO2. Let's just call it "iLO" to avoid having to
update strings for each iLO generation. This is similar to the change made
to hpwdt in commit 36e3ff44cebd7e46756dec88f30c982bebefdab7.

Signed-off-by: dann frazier <dannf@hp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>