Replace Rockchip delay timer by generic one

Use the generic delay timer instead of having a specific platform
file for configuring it.

Change-Id: Ifa68b9c97cd96ae1190cee74d22d729af95e4537
diff --git a/plat/rockchip/common/bl31_plat_setup.c b/plat/rockchip/common/bl31_plat_setup.c
index 30fb5ac..727a2c7 100644
--- a/plat/rockchip/common/bl31_plat_setup.c
+++ b/plat/rockchip/common/bl31_plat_setup.c
@@ -33,6 +33,7 @@
 #include <bl_common.h>
 #include <console.h>
 #include <debug.h>
+#include <generic_delay_timer.h>
 #include <mmio.h>
 #include <platform.h>
 #include <plat_private.h>
@@ -126,7 +127,7 @@
  ******************************************************************************/
 void bl31_platform_setup(void)
 {
-	plat_delay_timer_init();
+	generic_delay_timer_init();
 	plat_rockchip_soc_init();
 
 	/* Initialize the gic cpu and distributor interfaces */