cpu: sam3: remove obsolete hwtimer support

cpu/sam3/Makefile.include

@@ -1,8 +1,5 @@
 export CPU_ARCH = cortex-m3
 
-# use hwtimer compatibility module
-USEMODULE += hwtimer_compat
-
 # include common SPI functions
 USEMODULE += periph_common
 

cpu/sam3/include/hwtimer_cpu.h

@@ -1,41 +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_sam3
- * @{
- *
- * @file
- * @brief           CPU specific hwtimer configuration options
- *
- * @author          Hauke Petersen <hauke.petersen@fu-berlin.de>
- */
-
-#ifndef __HWTIMER_CPU_H
-#define __HWTIMER_CPU_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- * @name Hardware timer configuration
- * @{
- */
-#define HWTIMER_MAXTIMERS   6               /**< the CPU implementation supports 3 HW timers */
-#define HWTIMER_SPEED       1000000         /**< the HW timer runs with 1MHz */
-#define HWTIMER_MAXTICKS    (0xFFFFFFFF)    /**< 32-bit timer */
-/** @} */
-
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* __HWTIMER_CPU_H */
-/** @} */