arch: arc: update the ARC port

* add basic synopsys arc em processor support
* add basic arc nsim em virtual board support
* add basic arc mwdt toolchain support

Signed-off-by: Watson Zeng <zhiwei@synopsys.com>

examples/hello_world/hello_world.c

@@ -1,10 +1,10 @@
 #include "cmsis_os.h"
 
-#define TASK1_STK_SIZE          512
+#define TASK1_STK_SIZE          1024
 void task1(void *arg);
 osThreadDef(task1, osPriorityNormal, 1, TASK1_STK_SIZE);
 
-#define TASK2_STK_SIZE          512
+#define TASK2_STK_SIZE          1024
 void task2(void *arg);
 osThreadDef(task2, osPriorityNormal, 1, TASK2_STK_SIZE);