boards: msba2: add xtimer tuning values, remove HW_TIMER define

boards/msba2/include/board.h

@@ -54,9 +54,12 @@ extern "C" {
 /** @} */
 
 /**
- * @brief Deprecated HW_TIMER definition (to be removed)
+ * @name xtimer tuning values
+ * @{
  */
-#define HW_TIMER             TIMER_DEV(0)
+#define XTIMER_OVERHEAD     7
+#define XTIMER_SHOOT_EARLY  3
+/** @} */
 
 /**
  * @brief initialize the board's clock system

cpu/lpc2387/Makefile.include

@@ -2,4 +2,4 @@ INCLUDES += -I$(RIOTCPU)/lpc2387/include
 
 include $(RIOTCPU)/arm7_common/Makefile.include
 
-USEMODULE += arm7_common periph periph_common bitfield newlib hwtimer_compat
+USEMODULE += arm7_common periph periph_common bitfield newlib