core: pinmux: implement rough solution #776

Job	Run time
Build and package cores	11m 24s
Split off zephyr_main	7s
Split off zephyr_unoq	6s
Split off zephyr	9s
Split off zephyr_contrib	7s
Test zephyr_main:giga	2m 29s
Test zephyr_main:niclasense	2m 38s
Test zephyr:unoq	2m 27s
Test zephyr_contrib:ek_ra8d1	2m 20s
Test zephyr_main:portentac33	2m 0s
Test zephyr_main:nano33ble	2m 27s
Test zephyr_main:opta	2m 33s
Test zephyr_main:portentah7	2m 29s
Test zephyr_contrib:frdm_mcxn947	2m 26s
Test zephyr_contrib:frdm_rw612	2m 29s
Collect logs	9s
Publish jsons	41s
Publish core	0s
verify-core	0s
cleanup-artifacts	4s
	37m 5s

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