boards: arduino: giga_r1: Fix partition size. #745

Job	Run time
Build and package cores	8m 36s
Split off zephyr_main	10s
Split off zephyr_contrib	14s
Split off zephyr_unoq	9s
Split off zephyr	13s
Test zephyr_main:nano33ble	2m 26s
Test zephyr_main:giga	5m 5s
Test zephyr_main:portentac33	2m 34s
Test zephyr_main:niclasense	2m 27s
Test zephyr_contrib:frdm_mcxn947	2m 56s
Test zephyr_contrib:ek_ra8d1	2m 26s
Test zephyr_main:opta	2m 33s
Test zephyr_contrib:frdm_rw612	2m 27s
Test zephyr_main:portentah7	2m 26s
Test zephyr:unoq	1m 49s
Collect logs	7s
Publish jsons	27s
Publish core	0s
verify-core	0s
cleanup-artifacts	3s
	37m 8s

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