AP_GPS: Switch to MultiAntenna rather then MovingBase on SBF dual ant… #6

Job	Run time
build (stm32f7, chibios, 6)	12m 44s
build (stm32f7, chibios, 10)	12m 6s
build (stm32h7, chibios, 6)	9m 21s
build (stm32h7, chibios, 10)	9m 21s
build (fmuv2-plane, chibios, 10)	4m 32s
build (periph-build, chibios, 10)	16m 10s
build (iofirmware, chibios, 6)	1m 22s
build (iofirmware, chibios, 10)	1m 40s
build (CubeOrange-bootloader, chibios, 6)	1m 18s
build (CubeOrange-bootloader, chibios, 10)	58s
build (revo-bootloader, chibios, 6)	1m 12s
build (revo-bootloader, chibios, 10)	1m 38s
build (stm32h7-debug, chibios, 6)	5m 56s
build (stm32h7-debug, chibios, 10)	5m 39s
build (fmuv3, chibios, 6)	10m 25s
build (fmuv3, chibios, 10)	10m 18s
build (revo-mini, chibios, 10)	9m 13s
build (MatekF405-Wing, chibios, 10)	9m 12s
build (CubeOrange-ODID, chibios, 10)	6m 39s
build (configure-all, chibios, 6)	6m 48s
build (configure-all, chibios, 10)	6m 19s
build (build-options-defaults-test, chibios, 6)	18m 52s
build (build-options-defaults-test, chibios, 10)	17m 55s
build (signing, chibios, 10)	7m 45s
build (stm32h7, chibios-py2)	9m 35s
	3h 16m 58s

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