Blackfin: move internal irq prototypes out of global namespace

These are only used in a few internal Blackfin places, so move the irq
prototypes out of the global header and into the internal irq one.  No
functional changes other than shuffling locales.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index fac1ec3..904a25d 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -29,6 +29,7 @@
 #include <asm/cpu.h>
 #include <asm/fixed_code.h>
 #include <asm/early_printk.h>
+#include <asm/irq_handler.h>
 
 u16 _bfin_swrst;
 EXPORT_SYMBOL(_bfin_swrst);