AP_GPS: Switch to MultiAntenna rather then MovingBase on SBF dual ant… #7

Job	Run time
build (stm32f7, chibios, 6)	50s
build (stm32f7, chibios, 10)	55s
build (stm32h7, chibios, 6)	51s
build (stm32h7, chibios, 10)	1m 7s
build (fmuv2-plane, chibios, 10)	54s
build (periph-build, chibios, 6)	1m 21s
build (periph-build, chibios, 10)	1m 20s
build (iofirmware, chibios, 6)	54s
build (iofirmware, chibios, 10)	1m 3s
build (CubeOrange-bootloader, chibios, 6)	1m 16s
build (CubeOrange-bootloader, chibios, 10)	1m 24s
build (revo-bootloader, chibios, 6)	53s
build (revo-bootloader, chibios, 10)	1m 27s
build (stm32h7-debug, chibios, 6)	53s
build (stm32h7-debug, chibios, 10)	1m 4s
build (fmuv3, chibios, 6)	56s
build (fmuv3, chibios, 10)	55s
build (revo-mini, chibios, 10)	1m 2s
build (MatekF405-Wing, chibios, 10)	1m 50s
build (configure-all, chibios, 6)	5m 7s
build (configure-all, chibios, 10)	4m 57s
build (stm32h7, chibios-py2)	1m 21s
	32m 20s

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