ARM: shmobile: Use clocksource_of_init() on r8a7790

Replace the call to shmobile_timer_init() with
clocksource_of_init(). This will allow us to
get rid of shmobile_timer_init().
Signed-off-by: Magnus Damm <damm@opensource.se>
[horms+renesas@verge.net.au: include linux/clocksource.h]
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/mach-shmobile/setup-r8a7790.c

@@ -18,6 +18,7 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
+#include <linux/clocksource.h>
 #include <linux/irq.h>
 #include <linux/kernel.h>
 #include <linux/of_platform.h>
@@ -263,7 +264,7 @@ void __init r8a7790_timer_init(void)
 	iounmap(base);
 #endif /* CONFIG_ARM_ARCH_TIMER */
 
-	shmobile_timer_init();
+	clocksource_of_init();
 }
 
 void __init r8a7790_init_delay(void)