changed SerialUSB.baud() etc. to return the actual CDC line coding #1172

Job	Run time
Check CMake usage (NUCLEO_F103RB)	45s
Check CMake usage (NUCLEO_H743ZI2)	53s
Check CMake usage (NUCLEO_F411RE)	48s
Check CMake usage (NUCLEO_L552ZE_Q)	48s
Check CMake usage (NUCLEO_L152RE)	45s
Check CMake usage (NUCLEO_F767ZI)	47s
Check CMake usage (P_NUCLEO_WB55RG)	51s
Check CMake usage (NUCLEO_U083RC)	46s
Check CMake usage (NUCLEO_G474RE)	47s
Check CMake usage (NUCLEO_F303RE)	46s
Check CMake usage (NUCLEO_F207ZG)	45s
Check CMake usage (NUCLEO_F091RC)	46s
Check CMake usage (NUCLEO_U575ZI_Q)	51s
Check CMake usage (NUCLEO_G0B1RE)	52s
Check CMake usage (NUCLEO_L073RZ)	47s
Check CMake usage (NUCLEO_WL55JC1)	49s
Check CMake usage (NUCLEO_H563ZI)	40s
Check CMake usage (NUCLEO_L476RG)	42s
Check CMake usage (NUCLEO_WBA55CG)	47s
	14m 55s

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