MTB_ADV_WISE_1570: disable MPU code until target properly supported

Author: Juho Eskeli

targets/targets.json

@@ -3225,16 +3225,16 @@
         "macros_add": [
             "MBEDTLS_CONFIG_HW_SUPPORT",
             "WISE_1570",
-            "TWO_RAM_REGIONS"
+            "TWO_RAM_REGIONS",
+            "MBED_MPU_CUSTOM"
         ],
         "device_has_add": [
             "ANALOGOUT",
             "CRC",
             "SERIAL_ASYNCH",
             "SERIAL_FC",
             "TRNG",
-            "FLASH",
-            "MPU"
+            "FLASH"
         ],
         "device_has_remove": ["LPTICKER"],
         "release_versions": ["5"],