[ARM] Fix SA1100 debug-macros.S

This needs asm/hardware.h - include it.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

include/asm-arm/arch-sa1100/debug-macro.S

@@ -10,6 +10,7 @@
  * published by the Free Software Foundation.
  *
 */
+#include <asm/hardware.h>
 
 		.macro	addruart,rx
 		mrc	p15, 0, \rx, c1, c0