cpu: k60: remove obsolete hwtimer support

cpu/k60/include/hwtimer_cpu.h

@@ -1,43 +0,0 @@
-/*
- * Copyright (C) 2015 Eistec AB
- *
- * 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_k60
- * @{
- *
- * @file
- * @brief           CPU specific hwtimer configuration options
- *
- * @author          Hauke Petersen <hauke.peterse@fu-berlin.de>
- */
-
-#ifndef HWTIMER_CPU_H_
-#define HWTIMER_CPU_H_
-
-#include "cpu.h"
-
-#ifdef __cplusplus
-extern "C"
-{
-#endif
-
-/**
- * @name Hardware timer configuration
- * @{
- */
-#define HWTIMER_MAXTIMERS   1               /**< the HW timer is using the LPTMR as its hardware timer */
-#define HWTIMER_SPEED       32768           /**< LPTMR is running at 32.768 kHz */
-#define HWTIMER_MAXTICKS (0xFFFFFFFF) /**< Virtually extended to 32 bits from 16 bits hardware counter. */
-/** @} */
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* HWTIMER_CPU_H_ */
-/** @} */