variants/arduino_portenta_h7_stm32h747xx_m7: Update board config. #692

Job	Run time
Build and package cores	12m 6s
Split off zephyr	10s
Split off zephyr_unoq	15s
Split off zephyr_contrib	15s
Split off zephyr_main	10s
Test zephyr_main:giga	2m 32s
Test zephyr_main:portentah7	2m 30s
Test zephyr_main:niclasense	1m 57s
Test zephyr_contrib:ek_ra8d1	2m 27s
Test zephyr_main:opta	2m 42s
Test zephyr:unoq	2m 18s
Test zephyr_main:nano33ble	2m 26s
Test zephyr_contrib:frdm_rw612	2m 27s
Test zephyr_contrib:frdm_mcxn947	2m 21s
Test zephyr_main:portentac33	2m 26s
Publish jsons	22s
Collect logs	10s
verify-core	0s
Publish core	0s
cleanup-artifacts	3s
	37m 37s

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