AP_HAL_ChibiOS: modify MatekH7A3 hwdef #29379

Job	Run time
build (chibios, Durandal)	16m 39s
build (chibios, MatekF405)	14m 42s
build (chibios, KakuteF7)	13m 21s
build (chibios, MatekH743-bdshot)	16m 30s
build (chibios, Pixhawk1-1M)	14m 32s
build (chibios, MatekF405-CAN)	1m 43s
build (chibios, DrotekP3Pro)	2m 29s
build (chibios, Hitec-Airspeed)	2m 4s
build (chibios, f103-GPS)	4m 3s
build (disco, armhf)	14m 24s
	1h 40m 27s

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