drivers: dac: dacx3608: Fix bad shift operation #150180

Job	Run time
twister-build-prep / prep_pr	2m 51s
twister-build-prep / prep_push	0s
twister-build (1)	25m 30s
twister-build (2)	42m 4s
twister-build (3)	26m 59s
twister-build (4)	39m 15s
twister-build (5)	26m 21s
twister-build (6)	25m 1s
twister-build (7)	25m 14s
Publish Unit Tests Results	15s
Check Twister Status / all jobs passed	1s
	3h 33m 31s

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