Add MPU label and fix labels alignment

Author: ChazJin

targets/targets.json

@@ -7434,14 +7434,36 @@
         "public": false,
         "extra_labels": ["GigaDevice"],
         "supported_toolchains": ["ARM", "IAR", "GCC_ARM"],
-        "device_has":["USTICKER", "ANALOGIN", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "SERIAL"]
+        "device_has": [
+            "USTICKER",
+            "ANALOGIN",
+            "INTERRUPTIN",
+            "PORTIN", "PORTINOUT",
+            "PORTOUT",
+            "PWMOUT",
+            "SERIAL"
+        ]
     },
     "GD32_F307VG": {
         "inherits": ["GD32_Target"],
         "supported_form_factors": ["ARDUINO"],
         "core": "Cortex-M4",
         "extra_labels_add": ["GD32F30X", "GD32F307VG", "GD_EMAC"],
-        "device_has_add": ["RTC", "I2C", "CAN", "I2CSLAVE", "ANALOGOUT", "SPI", "SPISLAVE", "SERIAL_ASYNCH", "SERIAL_FC", "EMAC", "FLASH", "SLEEP"],
+        "device_has_add": [
+            "RTC",
+            "I2C",
+            "CAN",
+            "I2CSLAVE",
+            "ANALOGOUT",
+            "SPI",
+            "SPISLAVE",
+            "SERIAL_ASYNCH",
+            "SERIAL_FC",
+            "EMAC",
+            "FLASH",
+            "SLEEP",
+            "MPU"
+        ],
         "detect_code": ["1701"],
         "macros_add": ["GD32F30X_CL"],
         "release_versions": ["5"],