Remove LOWPOWERTIMER as it has been replaced by LPTICKER

Author: felser

targets/targets.json

@@ -2183,7 +2183,7 @@
         },
         "macros_add": ["TWO_RAM_REGIONS"],
         "detect_code": ["0312"],
-        "device_has_add": ["ANALOGOUT", "CAN", "LOWPOWERTIMER", "SERIAL_ASYNCH", "SERIAL_FC", "TRNG", "FLASH"],
+        "device_has_add": ["ANALOGOUT", "CAN", "SERIAL_ASYNCH", "SERIAL_FC", "TRNG", "FLASH"],
         "release_versions": ["2", "5"],
         "device_name": "STM32L471QG",
         "bootloader_supported": true