Add realtek rts5912 soc #149953

Job	Run time
twister-build-prep / prep_pr	3m 28s
twister-build-prep / prep_push	0s
twister-build (1)	28m 33s
twister-build (2)	31m 40s
twister-build (3)	28m 57s
twister-build (4)	45m 22s
twister-build (5)	24m 23s
twister-build (6)	22m 6s
twister-build (7)	28m 53s
twister-build (8)	38m 28s
Publish Unit Tests Results	18s
Check Twister Status / all jobs passed	1s
	4h 12m 9s

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