PCI: altera: Allow building as module

Altera PCIe Rootport IP is a soft IP and is only available after
an FPGA image (whose design contains it) is programmed.

Make driver modulable to support use cases when FPGA image is
programmed after the kernel has booted, so that the driver
can be loaded upon request.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

drivers/pci/controller/Kconfig

@@ -174,7 +174,7 @@ config PCIE_IPROC_MSI
 	  PCIe controller
 
 config PCIE_ALTERA
-	bool "Altera PCIe controller"
+	tristate "Altera PCIe controller"
 	depends on ARM || NIOS2 || ARM64 || COMPILE_TEST
 	help
 	  Say Y here if you want to enable PCIe controller support on Altera