Blackfin arch: move out irq related functions

move irq related functions into asm/irq.h and out of the mondo asm/system.h

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

arch/blackfin/kernel/vmlinux.lds.S

@@ -109,7 +109,6 @@ SECTIONS
 #endif
 
 		DATA_DATA
-		*(.data)
 		CONSTRUCTORS
 
 		/* make sure the init_task is aligned to the