rtos: remove config.h includes from stackings headers

And add its own header to the rtos_xxx_stackings.c

Signed-off-by: Erhan Kurubas <erhan.kurubas@espressif.com>
Change-Id: I084130fde7ee8645129a7cf60bb7bf59448e2f39
Reviewed-on: https://review.openocd.org/c/openocd/+/7441
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

src/rtos/rtos_chibios_stackings.c

@@ -14,6 +14,7 @@
 
 #include "rtos.h"
 #include "target/armv7m.h"
+#include "rtos_chibios_stackings.h"
 
 static const struct stack_register_offset rtos_chibios_arm_v7m_stack_offsets[ARMV7M_NUM_CORE_REGS] = {
 	{ ARMV7M_R0,   -1,   32 },		/* r0   */