Blackfin: glue XIP/ROM kernel kconfigs

Different arches use different names, so make sure we define both so
common code (like MTD_XIP) "just works".

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index dd5970d..d9a1cb7 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -928,6 +928,12 @@
 
 endchoice
 
+# Common code uses "ROMKERNEL" or "XIP_KERNEL", so define both
+config XIP_KERNEL
+	bool
+	default y
+	depends on ROMKERNEL
+
 source "mm/Kconfig"
 
 config BFIN_GPTIMERS