First coarse run to fix coding style in locm3.

Added --terse and --mailback options to the make stylecheck target. It
also does continue even if it enounters a possible error.

We decided on two exceptions from the linux kernel coding standard:
- Empty wait while loops may end with ; on the same line.
- All blocks after while, if, for have to be in brackets even if they
  only contain one statement. Otherwise it is easy to introduce an
  error.

Checkpatch needs to be adapted to reflect those changes.

lib/stm32/l1/timer.c

@@ -41,7 +41,8 @@
 Set timer options register on TIM2 or TIM3, used for trigger remapping.
 
 @param[in] timer_peripheral Unsigned int32. Timer register address base
-@returns Unsigned int32. Option flags TIM2: @ref tim2_opt_trigger_remap, TIM3: @ref tim3_opt_trigger_remap.
+@returns Unsigned int32. Option flags TIM2: @ref tim2_opt_trigger_remap, TIM3:
+@ref tim3_opt_trigger_remap.
 */
 
 void timer_set_option(u32 timer_peripheral, u32 option)