cmake: Pass OPTIMIZATION_FLAG to linker too #170312

Job	Run time
twister-build-prep / prep_pr	3m 58s
twister-build-prep / prep_push	0s
twister-build (1)	36m 21s
twister-build (2)	34m 52s
twister-build (3)	38m 29s
twister-build (4)	33m 51s
twister-build (5)	24m 18s
twister-build (6)	32m 15s
Publish Unit Tests Results	14s
Check Twister Status / all jobs passed	1s
	3h 24m 19s

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