drivers: ethernet: ksz8081: streamline codebase #148195

Job	Run time
twister-build-prep / prep_pr	2m 46s
twister-build-prep / prep_push	0s
twister-build (1)	26m 34s
twister-build (2)	32m 31s
twister-build (3)	28m 31s
twister-build (4)	30m 29s
twister-build (5)	32m 12s
twister-build (6)	26m 40s
twister-build (7)	29m 9s
twister-build (8)	30m 50s
Publish Unit Tests Results	16s
Check Twister Status / all jobs passed	3s
	4h 0m 1s

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