Fixed LWIP/EMAC issue for additional targets

Author: Cruz Monrreal II

targets/targets.json

@@ -3514,6 +3514,7 @@
         "inherits": ["EFM32GG11B820F2048GL192"],
         "device_name": "EFM32GG11B820F2048GL192",
         "device_has": ["ANALOGIN", "CRC", "EMAC", "I2C", "I2CSLAVE", "I2C_ASYNCH", "INTERRUPTIN", "LPTICKER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPISLAVE", "SPI_ASYNCH", "STDIO_MESSAGES", "USTICKER", "TRNG", "FLASH"],
+        "features": ["LWIP"],
         "forced_reset_timeout": 5,
         "config": {
             "hf_clock_src": {