refactor: FLASH size optimisations for B&W. #9521

Job	Run time
Run tests (x9dp2019)	2m 46s
Run tests (tx16s)	5m 2s
Run tests (nv14)	5m 15s
Run tests (el18)	5m 2s
Run tests (pl18)	5m 0s
Run tests (pl18ev)	5m 5s
Run tests (t12)	2m 36s
Run tests (t16)	5m 4s
Run tests (t18)	5m 24s
Run tests (t8)	2m 36s
Run tests (tlite)	2m 38s
Run tests (t20)	2m 36s
Run tests (t14)	2m 38s
Run tests (t20v2)	2m 51s
Run tests (tx12)	2m 37s
Run tests (x10)	5m 5s
Run tests (x12s)	5m 9s
Run tests (x7)	2m 53s
Run tests (x9d)	2m 49s
Run tests (x9dp)	2m 38s
Run tests (x9e)	2m 34s
Run tests (x9lite)	2m 58s
Run tests (x9lites)	2m 56s
Run tests (xlite)	2m 50s
Run tests (xlites)	2m 39s
Run tests (mt12)	2m 49s
Run builds (nv14;el18)	4m 57s
Run builds (pl18;pl18ev)	4m 58s
Run builds (t12)	1m 38s
Run builds (t16;t18)	5m 7s
Run builds (t8;zorro;pocket;mt12;commando8)	4m 26s
Run builds (tlite;tpro;tprov2;lr3pro)	3m 29s
Run builds (t20;t20v2;t14)	2m 45s
Run builds (tx12;tx12mk2;boxer)	2m 54s
Run builds (tx16s)	3m 1s
Run builds (x10;x10-access)	5m 16s
Run builds (x12s)	3m 0s
Run builds (x7;x7-access)	2m 12s
Run builds (x9d;x9dp;x9dp2019)	3m 0s
Run builds (x9e;x9e-hall)	2m 11s
Run builds (x9lite;x9lites)	2m 22s
Run builds (xlite;xlites)	2m 32s
Run builds (mt12)	1m 30s
Package firmwares	4s
	2h 27m 52s

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