Blackfin arch: move include/asm-blackfin header files to arch/blackfin

Signed-off-by: Bryan Wu <cooloney@kernel.org>

diff --git a/arch/blackfin/mach-common/dpmc_modes.S b/arch/blackfin/mach-common/dpmc_modes.S
index 838b0b2..ad5431e 100644
--- a/arch/blackfin/mach-common/dpmc_modes.S
+++ b/arch/blackfin/mach-common/dpmc_modes.S
@@ -6,7 +6,7 @@
 
 #include <linux/linkage.h>
 #include <asm/blackfin.h>
-#include <asm/mach/irq.h>
+#include <mach/irq.h>
 #include <asm/dpmc.h>
 
 .section .l1.text