variants/arduino_portenta_h7_stm32h747xx_m7: Update board config. #677

Job	Run time
Build and package cores	8m 54s
Split off zephyr	14s
Split off zephyr_contrib	8s
Split off zephyr_unoq	7s
Split off zephyr_main	8s
Test zephyr_main:portentah7	2m 31s
Test zephyr_main:nano33ble	2m 32s
Test zephyr:unoq	2m 23s
Test zephyr_main:opta	2m 32s
Test zephyr_main:niclasense	1m 55s
Test zephyr_main:giga	2m 42s
Test zephyr_contrib:frdm_rw612	2m 23s
Test zephyr_contrib:frdm_mcxn947	2m 26s
Test zephyr_contrib:ek_ra8d1	2m 20s
Test zephyr_main:portentac33	2m 32s
Collect logs	7s
Publish jsons	27s
Publish core	0s
verify-core	0s
cleanup-artifacts	3s
	34m 24s

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