Several functions perform the same WMI read int with different query
arguments. Refactor this into a single hp_wmi_read_int function.
Signed-off-by: NDarren Hart (VMware) <dvhart@infradead.org>
Tested-by: NCarlo Caione <carlo@endlessm.com>
Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>