Fix MISRA rule 8.3 in common code

Rule 8.3: All declarations of an object or function shall
          use the same names and type qualifiers.

Change-Id: Iff384187c74a598a4e73f350a1893b60e9d16cec
Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>
diff --git a/include/drivers/delay_timer.h b/include/drivers/delay_timer.h
index 4e44a5e..b28f619 100644
--- a/include/drivers/delay_timer.h
+++ b/include/drivers/delay_timer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -25,7 +25,7 @@
 
 void mdelay(uint32_t msec);
 void udelay(uint32_t usec);
-void timer_init(const timer_ops_t *ops);
+void timer_init(const timer_ops_t *ops_ptr);
 
 
 #endif /* __DELAY_TIMER_H__ */