Convert CONFIG_CMD_PCI to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_PCI

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/arch/powerpc/cpu/mpc85xx/Kconfig b/arch/powerpc/cpu/mpc85xx/Kconfig
index 93a454c..22fd306 100644
--- a/arch/powerpc/cpu/mpc85xx/Kconfig
+++ b/arch/powerpc/cpu/mpc85xx/Kconfig
@@ -489,6 +489,7 @@
 	imply CMD_EEPROM
 	imply CMD_MTDPARTS
 	imply CMD_NAND
+	imply CMD_PCI
 
 config ARCH_C29X
 	bool
@@ -503,6 +504,7 @@
 	select SYS_PPC_E500_USE_DEBUG_TLB
 	select FSL_IFC
 	imply CMD_NAND
+	imply CMD_PCI
 
 config ARCH_MPC8536
 	bool
@@ -633,6 +635,7 @@
 	imply CMD_MTDPARTS
 	imply CMD_NAND
 	imply CMD_SATA
+	imply CMD_PCI
 
 config ARCH_P1011
 	bool
@@ -663,6 +666,7 @@
 	select FSL_ELBC
 	imply CMD_NAND
 	imply CMD_SATA
+	imply CMD_PCI
 
 config ARCH_P1021
 	bool
@@ -724,6 +728,7 @@
 	imply CMD_EEPROM
 	imply CMD_NAND
 	imply CMD_SATA
+	imply CMD_PCI
 
 config ARCH_P1025
 	bool
@@ -1076,6 +1081,7 @@
 
 config E500MC
 	bool
+	imply CMD_PCI
 	help
 		Enble PowerPC E500MC core