Bugfix: Required to enabled EFR32_ATTESTATION_CREDENTIALS.

[rcasallas-silabs]

Required to use custom credentials.

Tested on EFR32MG12, and EFR32MG24.

[github-actions]

PR #25417: Size comparison from e0ce9e0 to b7b0ff7

Increases (1 build for cc32xx)

platform	target	config	section	e0ce9e0	b7b0ff7	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL	.debug_info	20262922	2026292	2	0.0

Full report (1 build for cc32xx)

platform	target	config	section	e0ce9e0	b7b0ff7	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	643465	643465	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	930213	930213	0	0.0
			.debug_aranges	87336	87336	0	0.0
			.debug_frame	300024	300024	0	0.0
			.debug_info	20262922	2026292	2	0.0
			.debug_line	2657815	2657815	0	0.0
			.debug_loc	2800026	2800026	0	0.0
			.debug_ranges	282240	282240	0	0.0
			.debug_str	3023883	3023883	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	105929	105929	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	378514	378514	0	0.0
			.symtab	256560	256560	0	0.0
			.text	535412	535412	0	0.0