fix: SPI: remove holes between transfer() #826

Job	Run time
Prepare build environment	3m 51s
Build loader for opta	1m 30s
Build loader for portentah7	2m 12s
Build loader for portentac33	1m 51s
Build loader for nano33ble	1m 11s
Build loader for ek_ra8d1	1m 7s
Build loader for unoq	2m 1s
Build loader for frdm_rw612	1m 20s
Build loader for giga	2m 50s
Build loader for niclasense	1m 20s
Build loader for frdm_mcxn947	1m 27s
Package zephyr	1m 2s
Package zephyr_unoq	26s
Package zephyr_contrib	25s
Package zephyr_main	49s
Clean up intermediates	5s
Test zephyr_main:nano33ble	2m 32s
Test zephyr_main:portentac33	1m 57s
Test zephyr_main:giga	2m 35s
Test zephyr_main:opta	2m 31s
Test zephyr:unoq	2m 23s
Test zephyr_contrib:ek_ra8d1	2m 24s
Test zephyr_main:niclasense	2m 38s
Test zephyr_contrib:frdm_mcxn947	2m 19s
Test zephyr_contrib:frdm_rw612	2m 25s
Test zephyr_main:portentah7	2m 27s
Prepare jsons	18s
Collect logs	7s
verify-core	0s
Publish core	0s
	48m 3s

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