Convert CONFIG_PCI_GT64120 to Kconfig

This converts the following to Kconfig:
   CONFIG_PCI_GT64120

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index f4c4aec..0ef5c29 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -101,6 +101,10 @@
 	  Note that this must be configured when boot because Linux driver
 	  expects the PCIe RC has been configured in the bootloader.
 
+config PCI_GT64120
+	bool "GT64120 PCI support"
+	depends on MIPS
+
 config PCI_PHYTIUM
 	bool "Phytium PCIe support"
 	help