cpu: lm4f120: remove obsolete hwtimer support

cpu/lm4f120/Makefile.include

@@ -1,7 +1,4 @@
 export CPU_ARCH = cortex-m4f
 
-# use hwtimer compatibility module
-USEMODULE += hwtimer_compat
-
 include $(RIOTCPU)/Makefile.include.cortexm_common
 include $(RIOTCPU)/stellaris_common/Makefile

cpu/lm4f120/include/cpu_conf.h

@@ -45,7 +45,6 @@ extern "C" {
 #include "stellaris_periph/uart.h"
 #include "stellaris_periph/fpu.h"
 #include "stellaris_periph/rom.h"
-#include "hwtimer_cpu.h"
 #include "periph/uart.h"
 
 #ifdef CPU_MODEL_LM4F120H5QR

cpu/lm4f120/include/hwtimer_cpu.h

@@ -1,42 +0,0 @@
-/*
- * Copyright (C) 2015 Rakendra Thapa <rakendrathapa@gmail.coa>
- *
- * 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_lm4f120
- * @{
- *
- * @file
- * @brief           CPU specific hwtimer configuration options
- *
- * @author          Rakendra Thapa <rakendrathapa@gmail.com>
- */
-
-#ifndef HWTIMER_CPU_H
-#define HWTIMER_CPU_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- * @name Hardware timer configuration
- * @{
- */
-#define HWTIMER_MAXTIMERS   1                      /**< the CPU implementation supports 4 HW timers */
-#define HWTIMER_SPEED       1000000                /**< the HW timer runs with 1MHz */
-#define HWTIMER_MAXTICKS    0xffffffff             /**< 32-bit timer */
-#define HWTIMER_MSEC        (HWTIMER_SPEED/1000)
-#define HWTIMER_SEC         (HWTIMER_SPEED/1000000)
-/**@}*/
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* HWTIMER_CPU_H */
-/** @} */