Convert CONFIG_CF_DSPI to Kconfig

This converts the following to Kconfig:
   CONFIG_CF_DSPI

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 97c0b7b..ae8d26d 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -113,6 +113,10 @@
 	bool
 	select MCF5441x
 
+# peripherals
+config CF_DSPI
+	bool
+
 choice
 	prompt "Target select"
 	optional
@@ -176,6 +180,7 @@
 
 config TARGET_STMARK2
         bool "Support stmark2"
+        select CF_DSPI
         select M54418
 
 endchoice