cpu: samd21: remove hwtimer support

cpu/samd21/Makefile.include

@@ -3,9 +3,6 @@ export CPU_ARCH = cortex-m0plus
 # this CPU implementation doesn't use CMSIS initialisation
 export CFLAGS += -DDONT_USE_CMSIS_INIT
 
-# use the hwtimer compatibility layer
-USEMODULE += hwtimer_compat
-
 # use common periph functions
 USEMODULE += periph_common
 

cpu/samd21/include/hwtimer_cpu.h

@@ -1,40 +0,0 @@
-/*
- * Copyright (C) 2014 Freie Universität Berlin
- *
- * 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_samd21
- * @{
- *
- * @file
- * @brief           CPU specific hwtimer configuration options
- *
- * @author          Thomas Eichinger <thomas.eichinger@fu-berlin.de>
- */
-
-#ifndef __HWTIMER_CPU_H
-#define __HWTIMER_CPU_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- * @name Hardware timer configuration
- * @{
- */
-#define HWTIMER_MAXTIMERS   2               /**< the CPU implementation supports 1 HW timer */
-#define HWTIMER_SPEED       (1000000U)      /**< the HW timer runs with 1MHz */
-#define HWTIMER_MAXTICKS    (0xFFFFFFFF)    /**< 32-bit timer */
-/** @} */
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* __HWTIMER_CPU_H */
-/** @} */