fix: restore master serial option #9076

Job	Run time
Run tests (x9dp2019)	2m 46s
Run tests (tx16s)	5m 17s
Run tests (nv14)	5m 9s
Run tests (el18)	4m 56s
Run tests (pl18)	4m 55s
Run tests (pl18ev)	5m 8s
Run tests (t12)	2m 44s
Run tests (t16)	5m 17s
Run tests (t18)	5m 8s
Run tests (t8)	2m 44s
Run tests (tlite)	2m 44s
Run tests (t20)	2m 39s
Run tests (t14)	2m 47s
Run tests (tx12)	2m 47s
Run tests (x10)	5m 4s
Run tests (x12s)	5m 3s
Run tests (x7)	2m 33s
Run tests (x9d)	2m 35s
Run tests (x9dp)	2m 42s
Run tests (x9e)	2m 40s
Run tests (x9lite)	2m 31s
Run tests (x9lites)	2m 52s
Run tests (xlite)	2m 40s
Run tests (xlites)	2m 36s
Run tests (mt12)	2m 51s
Run builds (nv14;el18)	4m 46s
Run builds (pl18;pl18ev)	4m 56s
Run builds (t12)	1m 24s
Run builds (t16;t18)	4m 57s
Run builds (t8;zorro;pocket;mt12;commando8)	4m 11s
Run builds (tlite;tpro;tprov2;lr3pro)	3m 28s
Run builds (t20;t14)	2m 6s
Run builds (tx12;tx12mk2;boxer)	2m 51s
Run builds (tx16s)	2m 52s
Run builds (x10;x10-access)	5m 7s
Run builds (x12s)	3m 3s
Run builds (x7;x7-access)	2m 6s
Run builds (x9d;x9dp;x9dp2019)	2m 44s
Run builds (x9e;x9e-hall)	2m 4s
Run builds (x9lite;x9lites)	2m 9s
Run builds (xlite;xlites)	2m 19s
Run builds (mt12)	1m 29s
Package firmwares	16s
	2h 21m 56s

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