Disable functional testing for DISCO

Board fails with active firmare corruption on factory_reset test.

https://jira.arm.com/browse/IOTCLT-3968

Author: teetak01

README.md

@@ -20,7 +20,7 @@ Board                          |  Connectivity     | Storage for credentials and
 `ST NUCLEO_F429ZI`                  | Ethernet          | Internal Flash          |
 `ST NUCLEO_F411RE`                  | Wi-Fi ESP8266     | SD card                 |
 `Ublox UBLOX_EVK_ODIN_W2`           | Wi-Fi             | SD card                 |
-`ST DISCO_L475VG_IOT01A`            | Wi-Fi             | QSPIF                   |
+`ST DISCO_L475VG_IOT01A`            | Wi-Fi             | QSPIF                   | Build-only
 `Ublox UBLOX_C030_U201`             | Cellular          | SD card                 | Build-only
 `Ublox UBLOX_C030_R412M`            | Cellular          | SD card                 | Build-only
 `Embedded Planet EP_AGORA`          | Cellular          | SPIF                    | Build-only

mbed_app.json

@@ -264,8 +264,7 @@
             "update-client.firmware-header-version"     : "2",
             "update-client.storage-address"             : "(MBED_CONF_STORAGE_FILESYSTEM_EXTERNAL_BASE_ADDRESS + MBED_CONF_STORAGE_FILESYSTEM_EXTERNAL_SIZE)",
             "update-client.storage-locations"           : 1,
-            "update-client.storage-size"                : "((MBED_ROM_START + MBED_ROM_SIZE - APPLICATION_ADDR) * MBED_CONF_UPDATE_CLIENT_STORAGE_LOCATIONS)",
-            "run-ci"                                    : 2
+            "update-client.storage-size"                : "((MBED_ROM_START + MBED_ROM_SIZE - APPLICATION_ADDR) * MBED_CONF_UPDATE_CLIENT_STORAGE_LOCATIONS)"
         },
         "EP_AGORA": {
             "target.features_remove"                    : ["BLE", "CRYPTOCELL310"],