stmark2: Migrate CONFIG_SYS_EXTRA_OPTIONS to Kconfig

This platform is the only one to set these options, so define them in
the board Kconfig file.

Cc: Angelo Dureghello <angelo@sysam.it>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/sysam/stmark2/Kconfig b/board/sysam/stmark2/Kconfig
index 87ab7ab..4abcdb3 100644
--- a/board/sysam/stmark2/Kconfig
+++ b/board/sysam/stmark2/Kconfig
@@ -1,5 +1,12 @@
 if TARGET_STMARK2
 
+config CF_SBF
+	def_bool y
+
+config SYS_INPUT_CLKSRC
+	hex
+	default 30000000
+
 config SYS_CPU
 	default "mcf5445x"