Arduino_LED_Matrix: add const to matrixWrite #876

Job	Run time
Prepare build environment	4m 45s
Build loader for nano_matter	2m 2s
Build loader for unoq	1m 16s
Build loader for portentah7	2m 27s
Build loader for frdm_mcxn947	2m 19s
Build loader for nano33ble	1m 43s
Build loader for opta	3m 1s
Build loader for portentac33	2m 17s
Build loader for ek_ra8d1	1m 29s
Build loader for niclasense	1m 32s
Build loader for frdm_rw612	2m 54s
Build loader for giga	2m 12s
Package zephyr_unoq	21s
Package zephyr	3m 37s
Package zephyr_contrib	32s
Package zephyr_main	52s
Clean up intermediates	5s
Test zephyr_main:portentac33	2m 32s
Test zephyr_contrib:ek_ra8d1	2m 21s
Test zephyr_contrib:frdm_rw612	2m 19s
Test zephyr_main:niclasense	2m 25s
Test zephyr_main:nano_matter	2m 27s
Test zephyr_contrib:frdm_mcxn947	2m 22s
Test zephyr:unoq	2m 20s
Test zephyr_main:portentah7	2m 30s
Test zephyr_main:nano33ble	2m 27s
Test zephyr_main:giga	2m 29s
Test zephyr_main:opta	2m 27s
Collect logs	10s
Prepare jsons	14s
verify-core	0s
Publish core	0s
	1h 0m 27s

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