ZephyrUDP: add missing pragma once into header file #787

Job	Run time
Build and package cores	8m 52s
Split off zephyr_main	14s
Split off zephyr	17s
Split off zephyr_unoq	15s
Split off zephyr_contrib	15s
Test zephyr_main:nano33ble	2m 25s
Test zephyr_main:niclasense	2m 25s
Test zephyr_main:giga	2m 28s
Test zephyr:unoq	2m 16s
Test zephyr_contrib:ek_ra8d1	2m 19s
Test zephyr_main:portentah7	2m 34s
Test zephyr_main:portentac33	2m 29s
Test zephyr_contrib:frdm_rw612	2m 21s
Test zephyr_main:opta	2m 49s
Test zephyr_contrib:frdm_mcxn947	2m 19s
Collect logs	7s
Publish core	13s
Publish jsons	22s
verify-core	0s
cleanup-artifacts	3s
	35m 3s

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