platform/x86: intel-vbtn: Use acpi_has_method to check for switch

The check for a device having virtual buttons is done using
acpi_has_method(..."VBDL"). Mimic that for checking virtual switch
presence.
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20240329143206.2977734-2-gwendal@chromium.orgReviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

drivers/platform/x86/intel/vbtn.c

@@ -258,9 +258,6 @@ static const struct dmi_system_id dmi_switches_allow_list[] = {
 
 static bool intel_vbtn_has_switches(acpi_handle handle, bool dual_accel)
 {
-	unsigned long long vgbs;
-	acpi_status status;
-
 	/* See dual_accel_detect.h for more info */
 	if (dual_accel)
 		return false;
@@ -268,8 +265,7 @@ static bool intel_vbtn_has_switches(acpi_handle handle, bool dual_accel)
 	if (!dmi_check_system(dmi_switches_allow_list))
 		return false;
 
-	status = acpi_evaluate_integer(handle, "VGBS", NULL, &vgbs);
-	return ACPI_SUCCESS(status);
+	return acpi_has_method(handle, "VGBS");
 }
 
 static int intel_vbtn_probe(struct platform_device *device)