Blackfin arch: make ROM_BASE depend on ROMKERNEL

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index 72ff719..b8bc5a4 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -372,6 +372,7 @@
 
 config ROM_BASE
 	hex "Kernel ROM Base"
+	depends on ROMKERNEL
 	default "0x20040000"
 	range 0x20000000 0x20400000 if !(BF54x || BF561)
 	range 0x20000000 0x30000000 if (BF54x || BF561)