dm: pci: Disable PCI compatibility functions by default

We eventually need to drop the compatibility functions for driver model. As
a first step, create a configuration option to enable them and hide them
when the option is disabled.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 16ba4f4..7e7cb61 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -93,6 +93,9 @@
 	depends on X86_RESET_VECTOR
 	default 0xfffff800
 
+config DM_PCI_COMPAT
+	default y	# Until we finish moving over to the new API
+
 config BOARD_ROMSIZE_KB_512
 	bool
 config BOARD_ROMSIZE_KB_1024