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/BSC9131RDB_SPIFLASH_SYSCLK100_defconfig b/configs/BSC9131RDB_SPIFLASH_SYSCLK100_defconfig
index 576d193..4904da4 100644
--- a/configs/BSC9131RDB_SPIFLASH_SYSCLK100_defconfig
+++ b/configs/BSC9131RDB_SPIFLASH_SYSCLK100_defconfig
@@ -21,6 +21,7 @@
 CONFIG_CMD_FAT=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_SPANSION=y
+# CONFIG_PCI is not set
 CONFIG_SYS_NS16550=y
 CONFIG_FSL_ESPI=y
 CONFIG_USB=y