drivers: stepper: add stepper driver for allegro a4979 #166028

Job	Run time
twister-build-prep / prep_push	0s
twister-build-prep / prep_pr	3m 56s
twister-build (1)	36m 39s
twister-build (2)	42m 58s
twister-build (3)	37m 14s
twister-build (4)	40m 54s
twister-build (5)	36m 23s
twister-build (6)	34m 31s
Publish Unit Tests Results	14s
Check Twister Status / all jobs passed	1s
	3h 52m 50s

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