sh: Add romImage target to archhelp.

Adds an archhelp blurb for the romImage target so it is reflected in
'make help'.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/Makefile b/arch/sh/Makefile
index 2a7e73f..b6ff337 100644
--- a/arch/sh/Makefile
+++ b/arch/sh/Makefile
@@ -216,6 +216,7 @@
 
 define archhelp
 	@echo '  zImage 	           - Compressed kernel image'
+	@echo '  romImage	           - Compressed ROM image, if supported'
 	@echo '  vmlinux.srec	           - Create an ELF S-record'
 	@echo '* uImage  	           - Alias to bootable U-Boot image'
 	@echo '  uImage.srec	           - Create an S-record for U-Boot'