platform/x86: hp-wmi: Correct code style related issues

Update hp-wmi driver to address all code style issues reported
by checkpatch.pl script.

All changes were validated on a HP ZBook Workstation,
HP EliteBook x360, and HP EliteBook 850 G8 notebooks.

Signed-off-by: Jorge Lopez <jorge.lopez2@hp.com>
Link: https://lore.kernel.org/r/20220404203626.4311-2-jorge.lopez2@hp.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>