Use AP_GPS_FixType in AP_ExternalAHRS #42813

Job	Run time
build (stm32f7, chibios, 10)	8m 28s
build (stm32h7, chibios, 10)	8m 38s
build (fmuv2-plane, chibios, 10)	3m 51s
build (periph-build, chibios, 10)	5m 26s
build (iofirmware, chibios, 10)	3m 45s
build (CubeOrange-bootloader, chibios, 10)	3m 11s
build (fmuv3-bootloader, chibios, 10)	3m 11s
build (revo-bootloader, chibios, 10)	3m 12s
build (stm32h7-debug, chibios, 10)	7m 4s
build (fmuv3, chibios, 10)	13m 45s
build (revo-mini, chibios, 10)	6m 37s
build (MatekF405-Wing, chibios, 10)	6m 40s
build (CubeOrange-ODID, chibios, 10)	8m 12s
build (CubeRedPrimary-bootloader, chibios, 10)	3m 0s
build (configure-all, chibios, 10)	12m 33s
build (build-options-defaults-test, chibios, 10)	16m 9s
build (signing, chibios, 10)	7m 31s
build (CubeOrange-PPP, chibios, 10)	7m 10s
build (CubeRed-EKF2, chibios, 10)	7m 16s
build (SOHW, chibios, 10)	11m 43s
build (Pixhawk6X-PPPGW, chibios, 10)	3m 17s
build (new-check, chibios, 10)	11m 54s
	2h 42m 33s

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