ZephyrUDP: add missing pragma once into header file #788

Job	Run time
Build and package cores	2m 33s
Split off ${{ matrix.artifact }}	-1s
verify-core	4s
Test ${{ matrix.subarch }}:${{ matrix.board }}	0s
Collect logs	0s
cleanup-artifacts	6s
Publish core	0s
Publish jsons	0s
Build and package cores	9m 19s
Split off zephyr_unoq	6s
Split off zephyr	11s
Split off zephyr_contrib	10s
Split off zephyr_main	14s
Test zephyr_main:niclasense	2m 34s
Test zephyr_main:nano33ble	2m 28s
Test zephyr:unoq	2m 21s
Test zephyr_main:opta	1m 55s
Test zephyr_main:giga	1m 53s
Test zephyr_contrib:ek_ra8d1	1m 48s
Test zephyr_main:portentac33	2m 33s
Test zephyr_main:portentah7	1m 56s
Test zephyr_contrib:frdm_rw612	2m 20s
Test zephyr_contrib:frdm_mcxn947	2m 30s
Collect logs	7s
Publish jsons	15s
verify-core	0s
Publish core	0s
cleanup-artifacts	5s
	35m 27s

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