Add missing device_name for targets with bootloader

Author: amq

targets/targets.json

@@ -2763,6 +2763,7 @@
         "macros": ["EFM32PG12B500F1024GL125", "TRANSACTION_QUEUE_SIZE_SPI=4"],
         "supported_toolchains": ["GCC_ARM", "ARM", "uARM", "IAR"],
         "release_versions": ["2", "5"],
+        "device_name": "EFM32PG12B500F1024GL125",
         "public": false,
         "bootloader_supported": true
     },
@@ -2815,6 +2816,7 @@
         "macros": ["EFR32MG12P332F1024GL125", "TRANSACTION_QUEUE_SIZE_SPI=4"],
         "supported_toolchains": ["GCC_ARM", "ARM", "uARM", "IAR"],
         "release_versions": ["2", "5"],
+        "device_name": "EFR32MG12P332F1024GL125",
         "public": false,
         "bootloader_supported": true
     },