[Silabs] Build System cleanup

[jepenven-silabs]

Cleanup some unused feature from the build system to reduce code size.

[github-actions]

PR #25348: Size comparison from af511d7 to 528940c

Full report (1 build for cc32xx)

platform	target	config	section	af511d7	528940c	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	642601	642601	0	0.0
			(read/write)	203688	203688	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197088	197088	0	0.0
			.comment	194	194	0	0.0
			.data	1480	1480	0	0.0
			.debug_abbrev	930126	930126	0	0.0
			.debug_aranges	87280	87280	0	0.0
			.debug_frame	299812	299812	0	0.0
			.debug_info	20256131	20256131	0	0.0
			.debug_line	2656120	2656120	0	0.0
			.debug_loc	2797440	2797440	0	0.0
			.debug_ranges	281768	281768	0	0.0
			.debug_str	3023104	3023104	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	105761	105761	0	0.0
			.shstrtab	232	232	0	0.0
			.stab	204	204	0	0.0
			.stabstr	441	441	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	377825	377825	0	0.0
			.symtab	256224	256224	0	0.0
			.text	534716	534716	0	0.0

[github-actions]

PR #25348: Size comparison from 11c2f5b to 25c1dc5

Decreases (1 build for cc32xx)

platform	target	config	section	11c2f5b	25c1dc5	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL	.debug_info	20261953	20261952	-1	-0.0

Full report (3 builds for cc32xx, qpg)

platform	target	config	section	11c2f5b	25c1dc5	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	643001	643001	0	0.0
			(read/write)	203688	203688	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197088	197088	0	0.0
			.comment	194	194	0	0.0
			.data	1480	1480	0	0.0
			.debug_abbrev	930155	930155	0	0.0
			.debug_aranges	87280	87280	0	0.0
			.debug_frame	299824	299824	0	0.0
			.debug_info	20261953	20261952	-1	-0.0
			.debug_line	2657102	2657102	0	0.0
			.debug_loc	2799620	2799620	0	0.0
			.debug_ranges	282184	282184	0	0.0
			.debug_str	3023185	3023185	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	105881	105881	0	0.0
			.shstrtab	232	232	0	0.0
			.stab	204	204	0	0.0
			.stabstr	441	441	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	377825	377825	0	0.0
			.symtab	256240	256240	0	0.0
			.text	534996	534996	0	0.0
qpg	lighting-app	qpg6105+debug	(read/write)	1151532	1151532	0	0.0
			.bss	99804	99804	0	0.0
			.data	852	852	0	0.0
			.text	598628	598628	0	0.0
	lock-app	qpg6105+debug	(read/write)	1118740	1118740	0	0.0
			.bss	96292	96292	0	0.0
			.data	864	864	0	0.0
			.text	565840	565840	0	0.0