Convert CONFIG_PCI_SCAN_SHOW to Kconfig

This converts the following to Kconfig:
   CONFIG_PCI_SCAN_SHOW

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 0c74f95..f4c4aec 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -81,6 +81,10 @@
           support on PCI devices. This helps to skip some devices in BDF
           scan that are not present.
 
+config PCI_SCAN_SHOW
+	bool "Show PCI devices during startup"
+	depends on PCIE_IMX
+
 config PCIE_ECAM_GENERIC
 	bool "Generic ECAM-based PCI host controller support"
 	help