[ARM] i.MX add missing include

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/mach-imx/clock.c

@@ -23,7 +23,7 @@
 #include <linux/err.h>
 #include <linux/io.h>
 
-#include <mach/imx-regs.h>
+#include <mach/hardware.h>
 
 /*
  * Very simple approach: We can't disable clocks, so we do