mt76: mt7921: make mt7921_pci_driver static

mt7921_pci_driver struct is only referenced in mt7921/pci.c so make it
static.
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h

@@ -272,7 +272,6 @@ mt7921_hw_dev(struct ieee80211_hw *hw)
 	mt76_connac_mutex_release(&(dev)->mt76, &(dev)->pm)
 
 extern const struct ieee80211_ops mt7921_ops;
-extern struct pci_driver mt7921_pci_driver;
 
 u32 mt7921_reg_map(struct mt7921_dev *dev, u32 addr);
 

drivers/net/wireless/mediatek/mt76/mt7921/pci.c

@@ -489,7 +489,7 @@ static int mt7921_pci_resume(struct pci_dev *pdev)
 }
 #endif /* CONFIG_PM */
 
-struct pci_driver mt7921_pci_driver = {
+static struct pci_driver mt7921_pci_driver = {
 	.name		= KBUILD_MODNAME,
 	.id_table	= mt7921_pci_device_table,
 	.probe		= mt7921_pci_probe,