cpu: atmega2560: drop obsolete hwtimer support

cpu/atmega2560/Makefile.include

@@ -4,9 +4,6 @@ export CFLAGS += -DCOREIF_NG=1
 # tell the build system that the CPU depends on the atmega common files
 USEMODULE += atmega_common
 
-# use hwtimer compatibility module
-USEMODULE += hwtimer_compat
-
 # export the peripheral drivers to be linked into the final binary
 export USEMODULE += periph
 

cpu/atmega2560/include/hwtimer_cpu.h

@@ -1,40 +0,0 @@
-/*
- * Copyright (C) 2014 Freie Universität Berlin, Hinnerk van Bruinehsen
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- */
-
-/**
- * @ingroup         cpu_atmega2560
- * @{
- *
- * @file
- * @brief           CPU specific hwtimer configuration options
- *
- * @author          Hinnerk van Bruinehsen <h.v.bruinehsen@fu-berlin.de>
- */
-
-#ifndef __HWTIMER_CPU_H
-#define __HWTIMER_CPU_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- * @name Hardware timer configuration
- * @{
- */
-#define HWTIMER_MAXTIMERS   3           /**< the CPU implementation supports 3 HW timers */
-#define HWTIMER_SPEED       1000000     /**< the HW timer runs with 1MHz */
-#define HWTIMER_MAXTICKS    (0xFFFF)    /**< 16-bit timer */
-/** @} */
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* __HWTIMER_CPU_H */
-/** @} */