drivers/pci/Kconfig: Add PCI

Add 'PCI' as a menu option and migrate all existing users.

Signed-off-by: Tom Rini <trini@konsulko.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
diff --git a/configs/M5475CFE_defconfig b/configs/M5475CFE_defconfig
index 1fa20f1..e947b4c 100644
--- a/configs/M5475CFE_defconfig
+++ b/configs/M5475CFE_defconfig
@@ -10,5 +10,6 @@
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
 CONFIG_CMD_CACHE=y
+CONFIG_PCI=y
 CONFIG_USB=y
 CONFIG_USB_STORAGE=y