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/bfin_gpio.c b/arch/blackfin/kernel/bfin_gpio.c
index 170cf90..207bb6b 100644
--- a/arch/blackfin/kernel/bfin_gpio.c
+++ b/arch/blackfin/kernel/bfin_gpio.c
@@ -14,6 +14,7 @@
 #include <asm/gpio.h>
 #include <asm/portmux.h>
 #include <linux/irq.h>
+#include <asm/irq_handler.h>
 
 #if ANOMALY_05000311 || ANOMALY_05000323
 enum {