loader: fix missing pulseIn() implementation #822

Job	Run time
Build and package cores	10m 54s
Split off zephyr_contrib	6s
Split off zephyr_unoq	14s
Split off zephyr	10s
Split off zephyr_main	9s
Test zephyr_main:portentac33	2m 36s
Test zephyr_main:portentah7	2m 29s
Test zephyr_main:opta	2m 29s
Test zephyr_main:giga	2m 35s
Test zephyr_main:niclasense	2m 24s
Test zephyr_main:nano33ble	2m 31s
Test zephyr:unoq	2m 24s
Test zephyr_contrib:frdm_mcxn947	2m 27s
Test zephyr_contrib:ek_ra8d1	2m 19s
Test zephyr_contrib:frdm_rw612	2m 27s
Collect logs	8s
Publish jsons	20s
verify-core	0s
Publish core	0s
cleanup-artifacts	6s
	36m 48s

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