rtos: use struct member names instead of comments

This is more readable, and as a bonus the compiler will help out if the
definition of the struct changes.

Change-Id: Ibf660134d9900173f6592407d5cc2203654a4a1b
Signed-off-by: Tim Newsome <tim@sifive.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/6659
Tested-by: jenkins
Reviewed-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

src/rtos/rtos_embkernel_stackings.c

@@ -45,9 +45,9 @@ static const struct stack_register_offset rtos_embkernel_cortex_m_stack_offsets[
 };
 
 const struct rtos_register_stacking rtos_embkernel_cortex_m_stacking = {
-	0x40,					/* stack_registers_size */
-	-1,						/* stack_growth_direction */
-	ARMV7M_NUM_CORE_REGS,	/* num_output_registers */
-	rtos_generic_stack_align8,	/* stack_alignment */
-	rtos_embkernel_cortex_m_stack_offsets	/* register_offsets */
+	.stack_registers_size = 0x40,
+	.stack_growth_direction = -1,
+	.num_output_registers = ARMV7M_NUM_CORE_REGS,
+	.calculate_process_stack = rtos_generic_stack_align8,
+	.register_offsets = rtos_embkernel_cortex_m_stack_offsets
 };