bfin: reorg clock init steps for bf609

So that user can set the clocks through menuconfig.

Signed-off-by: Bob Liu <lliubbo@gmail.com>
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index 2baa493..f9f6f69 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -352,6 +352,11 @@
 	depends on (BFIN526_EZBRD)
 	default y
 
+config MEM_MT47H64M16
+	bool
+	depends on (BFIN609_EZKIT)
+	default y
+
 source "arch/blackfin/mach-bf518/Kconfig"
 source "arch/blackfin/mach-bf527/Kconfig"
 source "arch/blackfin/mach-bf533/Kconfig"