[ARM] Move asm/hardware/clock.h to linux/clk.h

This is needs to be visible to other architectures using the AMBA
bus and peripherals.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/usb/host/ohci-s3c2410.c b/drivers/usb/host/ohci-s3c2410.c
index add198a..372527a 100644
--- a/drivers/usb/host/ohci-s3c2410.c
+++ b/drivers/usb/host/ohci-s3c2410.c
@@ -20,9 +20,9 @@
 */
 
 #include <linux/platform_device.h>
+#include <linux/clk.h>
 
 #include <asm/hardware.h>
-#include <asm/hardware/clock.h>
 #include <asm/arch/usb-control.h>
 
 #define valid_port(idx) ((idx) == 1 || (idx) == 2)