sh: Bring kgdb back from the dead.

This code has suffered quite a bit of bitrot, do some basic
tidying to get it to a reasonably functional state again.
This gets the basic support and the console working again.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/include/asm-sh/se7751.h b/include/asm-sh/se7751.h
index 88cd379..02ca934 100644
--- a/include/asm-sh/se7751.h
+++ b/include/asm-sh/se7751.h
@@ -65,6 +65,8 @@
 
 #define IRQ_79C973	13
 
+void init_7751se_IRQ(void);
+
 #define __IO_PREFIX	sh7751se
 #include <asm/io_generic.h>