Fix non-fabric-filtered reads of Group Key Management attributes.

[bzbarsky-apple]

We were only returning the entries for the accessing fabric, not for all fabrics.

Fixes #23322

[github-actions]

PR #25319: Size comparison from 95772ae to 9090931

Increases above 0.2%:

platform	target	config	section	95772ae	9090931	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL	.debug_ranges	281768	282480	712	0.3

Increases (1 build for cc32xx)

platform	target	config	section	95772ae	9090931	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL	(read only)	642681	643497	816	0.1
			.debug_abbrev	930077	930099	22	0.0
			.debug_frame	299816	299820	4	0.0
			.debug_info	20256907	20260684	3777	0.0
			.debug_line	2656086	2657644	1558	0.1
			.debug_loc	2797535	2800203	2668	0.1
			.debug_ranges	281768	282480	712	0.3
			.symtab	256256	256320	64	0.0
			.text	534788	535604	816	0.2

Decreases (1 build for cc32xx)

platform	target	config	section	95772ae	9090931	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL	.debug_str	3023369	3023367	-2	-0.0

Full report (1 build for cc32xx)

platform	target	config	section	95772ae	9090931	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	642681	643497	816	0.1
			(read/write)	203672	203672	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197072	197072	0	0.0
			.comment	194	194	0	0.0
			.data	1480	1480	0	0.0
			.debug_abbrev	930077	930099	22	0.0
			.debug_aranges	87280	87280	0	0.0
			.debug_frame	299816	299820	4	0.0
			.debug_info	20256907	20260684	3777	0.0
			.debug_line	2656086	2657644	1558	0.1
			.debug_loc	2797535	2800203	2668	0.1
			.debug_ranges	281768	282480	712	0.3
			.debug_str	3023369	3023367	-2	-0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	105769	105769	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	256256	256320	64	0.0
			.text	534788	535604	816	0.2