simtech,helpers: fix warnings with -Wdiscarded-qualifiers
simtech/tests/test-modem-helpers-simtech.c: In function ‘test_clcc_urc_single’:
simtech/tests/test-modem-helpers-simtech.c:98:64: error: initialization discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers]
98 | { 1, MM_CALL_DIRECTION_INCOMING, MM_CALL_STATE_ACTIVE, "123456789" }
| ^~~~~~~~~~~
simtech/tests/test-modem-helpers-simtech.c: In function ‘test_clcc_urc_multiple’:
simtech/tests/test-modem-helpers-simtech.c:113:65: error: initialization discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers]
113 | { 2, MM_CALL_DIRECTION_INCOMING, MM_CALL_STATE_ACTIVE, "123456789" },
| ^~~~~~~~~~~
simtech/tests/test-modem-helpers-simtech.c:114:65: error: initialization discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers]
114 | { 3, MM_CALL_DIRECTION_INCOMING, MM_CALL_STATE_ACTIVE, "987654321" },
| ^~~~~~~~~~~
simtech/tests/test-modem-helpers-simtech.c: In function ‘test_clcc_urc_complex’:
simtech/tests/test-modem-helpers-simtech.c:130:65: error: initialization discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers]
130 | { 1, MM_CALL_DIRECTION_INCOMING, MM_CALL_STATE_ACTIVE, "123456789" },
| ^~~~~~~~~~~
simtech/tests/test-modem-helpers-simtech.c:131:65: error: initialization discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers]
131 | { 2, MM_CALL_DIRECTION_INCOMING, MM_CALL_STATE_WAITING, "987654321" },
| ^~~~~~~~~~~
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