Remove warnings of undeclared memcpy, strncpy, etc.
Update test-rilmodem-sms set_sca test case to take into account additional quotes used for sending a SET_SMSC_ADDRESS request.
Add new test-rilmodem-sms test cases for the remaining untested atom functions, including two tests for incoming SMS unsolicited responses. Also updated test-rilmodem-cs due to rilmodem-test-server changes.