staging, mt7621-pci: fix build without pci support

[ Upstream commit 90cd9bed5adb3e3bd4d3ac4cbcecbc4a8028bbaf ]

Add depends on PCI for PCI_MT7621
Signed-off-by: NMaxim Zhukov <mussitantesmortem@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NSasha Levin (Microsoft) <sashal@kernel.org>

drivers/staging/mt7621-pci/Kconfig

 config PCI_MT7621
 	tristate "MediaTek MT7621 PCI Controller"
 	depends on RALINK
+	depends on PCI
 	select PCI_DRIVERS_GENERIC
 	help
 	  This selects a driver for the MediaTek MT7621 PCI Controller.