hwdef: RadioLinkPIX6 uses SPL06 driver #13

Job	Run time
build (base)	7m 9s
build (clang)	8m 12s
build-gcc-heli	7m 43s
autotest-heli (sitltest-heli)	12m 33s
autotest (sitltest-copter-tests1a)	10m 24s
autotest (sitltest-copter-tests1b)	12m 4s
autotest (sitltest-copter-tests1c)	14m 23s
autotest (sitltest-copter-tests1d)	11m 37s
autotest (sitltest-copter-tests1e)	11m 25s
autotest (sitltest-copter-tests2a)	11m 40s
autotest (sitltest-copter-tests2b)	32m 22s
	2h 19m 32s

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