rtos/zephyr: Remove Zephyr RTOS suport for ARC_SEC cores

In issues zephyrproject-rtos/sdk-ng#631
and zephyrproject-rtos/zephyr#55686
root case is in an attempt to access arc registers at early stage of
OpenOCD initialization process. At this stage transport is not
configured and this cause fault with error
"Assertion `jtag_trst == 0' failed".

As temporary solution this patch remove early access to ARC cores.
This also disables Zephyr RTOS suport for ARC_SEC cores.

Signed-off-by: Nikolay Agishev <agishev@synopsys.com>

src/rtos/zephyr.c

@@ -422,26 +422,6 @@ static int zephyr_create(struct target *target)
 
 	LOG_INFO("Zephyr: looking for target: %s", name);
 
-	/* ARC specific, check if EM target has security subsystem
-	 * In case of ARC_HAS_SECURE zephyr option enabled
-	 * the thread stack contains blink,sec_stat,status32 register
-	 * values. If ARC_HAS_SECURE is disabled, only blink and status32
-	 * register values are saved on stack. */
-	if (!strcmp(name, "arcv2")) {
-		uint32_t value;
-		struct arc_common *arc = target_to_arc(target);
-		/* Reading SEC_BUILD bcr */
-		CHECK_RETVAL(arc_jtag_read_aux_reg_one(&arc->jtag_info, ARC_AUX_SEC_BUILD_REG, &value));
-		if (value != 0) {
-			LOG_DEBUG("ARC EM board has security subsystem, changing offsets");
-			arc_cpu_saved[ARC_REG_NUM - 1].offset = 8;
-			/* After reading callee registers in stack
-			 * now blink,sec_stat,status32 registers
-			 * are located. */
-			arc_cpu_saved_stacking.stack_registers_size = 12;
-		}
-	}
-
 	for (struct zephyr_params *p = zephyr_params_list; p->target_name; p++) {
 		if (!strcmp(p->target_name, name)) {
 			LOG_INFO("Zephyr: target known, params at %p", p);