tests: drivers: uart_async_api: fix userspace fault

Updated overlay files to test using nocache.
and run outside of usersapce mode to avoid
inaccessible memory regions when using nocache on RT parts.
Also updated testcase file to reflect nocache testing.

Signed-off-by: Emilio Benavente <[email protected]>

Author: EmilioCBen

tests/drivers/uart/uart_async_api/boards/mimxrt1010_evk.overlay

@@ -1,11 +1,5 @@
 /* SPDX-License-Identifier: Apache-2.0 */
 
-/ {
-	chosen {
-		zephyr,sram = &dtcm;
-	};
-};
-
 dut: &lpuart4 {
 	status = "okay";
 	current-speed = <115200>;

tests/drivers/uart/uart_async_api/boards/mimxrt1015_evk.overlay

@@ -1,11 +1,5 @@
 /* SPDX-License-Identifier: Apache-2.0 */
 
-/ {
-	chosen {
-		zephyr,sram = &dtcm;
-	};
-};
-
 dut: &lpuart4 {
 	status = "okay";
 	current-speed = <115200>;

tests/drivers/uart/uart_async_api/boards/mimxrt1020_evk.overlay

@@ -1,11 +1,5 @@
 /* SPDX-License-Identifier: Apache-2.0 */
 
-/ {
-	chosen {
-		zephyr,sram = &dtcm;
-	};
-};
-
 dut: &lpuart2 {
 	status = "okay";
 	current-speed = <115200>;

tests/drivers/uart/uart_async_api/boards/mimxrt1024_evk.overlay

@@ -1,11 +1,5 @@
 /* SPDX-License-Identifier: Apache-2.0 */
 
-/ {
-	chosen {
-		zephyr,sram = &dtcm;
-	};
-};
-
 dut: &lpuart2 {
 	status = "okay";
 	current-speed = <115200>;

tests/drivers/uart/uart_async_api/boards/mimxrt1050_evk.overlay

@@ -1,11 +1,5 @@
 /* SPDX-License-Identifier: Apache-2.0 */
 
-/ {
-	chosen {
-		zephyr,sram = &dtcm;
-	};
-};
-
 dut: &lpuart3 {
 	status = "okay";
 	current-speed = <115200>;

tests/drivers/uart/uart_async_api/boards/mimxrt1060_evk.overlay

@@ -1,11 +1,5 @@
 /* SPDX-License-Identifier: Apache-2.0 */
 
-/ {
-	chosen {
-		zephyr,sram = &dtcm;
-	};
-};
-
 dut: &lpuart3 {
 	status = "okay";
 	current-speed = <115200>;

tests/drivers/uart/uart_async_api/boards/mimxrt1060_evkb.overlay

@@ -1,11 +1,5 @@
 /* SPDX-License-Identifier: Apache-2.0 */
 
-/ {
-	chosen {
-		zephyr,sram = &dtcm;
-	};
-};
-
 dut: &lpuart3 {
 	status = "okay";
 	current-speed = <115200>;

tests/drivers/uart/uart_async_api/boards/mimxrt1064_evk.overlay

@@ -1,11 +1,5 @@
 /* SPDX-License-Identifier: Apache-2.0 */
 
-/ {
-	chosen {
-		zephyr,sram = &dtcm;
-	};
-};
-
 dut: &lpuart3 {
 	status = "okay";
 	current-speed = <115200>;

tests/drivers/uart/uart_async_api/boards/mimxrt1160_evk_mimxrt1166_cm7.overlay

@@ -1,11 +1,5 @@
 /* SPDX-License-Identifier: Apache-2.0 */
 
-/ {
-	chosen {
-		zephyr,sram = &dtcm;
-	};
-};
-
 dut: &lpuart2 {
 	status = "okay";
 	current-speed = <115200>;

tests/drivers/uart/uart_async_api/boards/mimxrt1170_evk_mimxrt1176_cm7_A.overlay

@@ -1,11 +1,5 @@
 /* SPDX-License-Identifier: Apache-2.0 */
 
-/ {
-	chosen {
-		zephyr,sram = &dtcm;
-	};
-};
-
 dut: &lpuart2 {
 	status = "okay";
 	current-speed = <115200>;