PCI: label: Fix compilation error when CONFIG_ACPI is unset

This patch fixes compilation error descibed below introduced by
the commit 6058989b

drivers/pci/pci-label.c: In function ‘pci_create_firmware_label_files’:
drivers/pci/pci-label.c:366:2: error: implicit declaration of function ‘device_has_dsm’
Signed-off-by: Narendra K <narendra_k@dell.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

drivers/pci/pci-label.c

@@ -174,6 +174,12 @@ pci_remove_acpi_index_label_files(struct pci_dev *pdev)
 	return -1;
 }
 
+static inline bool
+device_has_dsm(struct device *dev)
+{
+	return false;
+}
+
 #else
 
 static const char device_label_dsm_uuid[] = {