Disable BLE on Maxim targets until an updated driver becomes available

The current Maxim BLE driver only implements the old BLE API
which is deprecated and will be removed soon. Once an updated
BLE stack for Maxim becomes available, BLE feature can be
re-enabled.

Author: LDong-Arm

targets/targets.json

@@ -8680,9 +8680,6 @@
             "SPI",
             "STDIO_MESSAGES"
         ],
-        "features": [
-            "BLE"
-        ],
         "release_versions": [],
         "detect_code": [
             "0400"
@@ -8758,9 +8755,6 @@
             "SPI_ASYNCH",
             "STDIO_MESSAGES"
         ],
-        "features": [
-            "BLE"
-        ],
         "release_versions": [],
         "detect_code": [
             "0407"
@@ -8979,9 +8973,6 @@
             "USTICKER",
             "MPU"
         ],
-        "features": [
-            "BLE"
-        ],
         "release_versions": [
             "2",
             "5"