Callisto: add Callisto-2.5 variant #1484

Job	Run time
build (stm32f7, chibios, 10)	17m 24s
build (stm32h7, chibios, 10)	14m 45s
build (fmuv2-plane, chibios, 10)	8m 28s
build (periph-build, chibios, 10)	21m 29s
build (iofirmware, chibios, 10)	4m 57s
build (CubeOrange-bootloader, chibios, 10)	3m 36s
build (fmuv3-bootloader, chibios, 10)	3m 46s
build (revo-bootloader, chibios, 10)	3m 28s
build (stm32h7-debug, chibios, 10)	9m 27s
build (fmuv3, chibios, 10)	16m 1s
build (revo-mini, chibios, 10)	12m 51s
build (MatekF405-Wing, chibios, 10)	13m 30s
build (CubeOrange-ODID, chibios, 10)	10m 33s
build (CubeRedPrimary-bootloader, chibios, 10)	3m 27s
build (configure-all, chibios, 10)	12m 20s
build (build-options-defaults-test, chibios, 10)	22m 21s
build (signing, chibios, 10)	12m 0s
build (CubeOrange-PPP, chibios, 10)	9m 8s
build (CubeOrange-SOHW, chibios, 10)	9m 13s
build (Pixhawk6X-PPPGW, chibios, 10)	5m 34s
	3h 34m 18s

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