ACPI / processor: constify DMI system id table

There is no need to have processor_power_dmi_table[] writeable, constify
it.
Signed-off-by: NMathias Krause <minipli@googlemail.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/processor_idle.c

@@ -94,7 +94,7 @@ static int set_max_cstate(const struct dmi_system_id *id)
 	return 0;
 }
 
-static struct dmi_system_id processor_power_dmi_table[] = {
+static const struct dmi_system_id processor_power_dmi_table[] = {
 	{ set_max_cstate, "Clevo 5600D", {
 	  DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
 	  DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")},