boards: arduino: giga_r1: Fix partition size. #746

Job	Run time
Build and package cores	9m 51s
Split off zephyr_contrib	15s
Split off zephyr_unoq	7s
Split off zephyr_main	9s
Split off zephyr	9s
Test zephyr_main:portentac33	2m 38s
Test zephyr:unoq	2m 16s
Test zephyr_main:nano33ble	2m 33s
Test zephyr_main:opta	2m 40s
Test zephyr_main:giga	2m 34s
Test zephyr_main:portentah7	1m 52s
Test zephyr_contrib:frdm_rw612	2m 28s
Test zephyr_main:niclasense	2m 33s
Test zephyr_contrib:frdm_mcxn947	1m 48s
Test zephyr_contrib:ek_ra8d1	2m 26s
Collect logs	7s
Publish jsons	15s
verify-core	0s
Publish core	0s
cleanup-artifacts	6s
	34m 47s

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