boards: arm: stm32f746 with all mpu regions when testing in userspace

Disable the  quadspi mpu region of the nucleo_f746zg
when testing the samples/userspace/shared_mem
or tests/kernel/mem_protect/userspace
The stm32f7 cortex M7 has 8 MPU regions and the one for quadspi prevents
the testcase to PASS.

Signed-off-by: Francois Ramu <[email protected]>

Author: FRASTM

samples/userspace/shared_mem/boards/nucleo_f746zg.overlay

@@ -0,0 +1,13 @@
+/*
+ * Copyright 2023 STMicroelectronics
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * Disable quadspi MPU region for testing
+ * on this stm32f7 target
+ * else one region is missing among 8 MPU regions
+ */
+
+/delete-node/ &quadspi_memory;

tests/kernel/mem_protect/userspace/boards/nucleo_f746zg.overlay

@@ -0,0 +1,13 @@
+/*
+ * Copyright 2023 STMicroelectronics
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * Disable quadspi MPU region for testing
+ * on this stm32f7 target
+ * else one region is missing among 8 MPU regions
+ */
+
+/delete-node/ &quadspi_memory;