soc: espressif: fix chip revision reading #165803

Job	Run time
twister-build-prep / prep_pr	3m 46s
twister-build-prep / prep_push	0s
twister-build (1)	33m 32s
twister-build (2)	38m 15s
twister-build (3)	41m 48s
twister-build (4)	39m 18s
twister-build (5)	24m 31s
twister-build (6)	31m 23s
Publish Unit Tests Results	21s
Check Twister Status / all jobs passed	1s
	3h 32m 55s

Provide feedback