novatel-lte: fix warnings with -Wdiscarded-qualifiers
novatel/mm-broadband-modem-novatel-lte.c:249:7: error: initialization discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers]
249 | { "+CNUM", 3, TRUE, response_processor_cnum_ignore_at_errors },
| ^~~~~~~
novatel/mm-broadband-modem-novatel-lte.c:250:7: error: initialization discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers]
250 | { "$NWMDN", 3, TRUE, response_processor_nwmdn_ignore_at_errors },
| ^~~~~~~~