Remove unused IsController in src/protocols/secure_channel/Rendezvous…

[vivien-apple]

…Parameters.h

Problem

This code is unused as far as I can tell.

[github-actions]

PR #25999: Size comparison from 14ffac0 to 392d3b0

Increases (2 builds for cc32xx, nrfconnect)

platform	target	config	section	14ffac0	392d3b0	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL	.debug_info	20302987	20302988	1	0.0
nrfconnect	all-clusters-minimal-app	nrf52840dk_nrf52840	text	774004	774008	4	0.0

Full report (7 builds for cc32xx, mbed, nrfconnect, qpg)

platform	target	config	section	14ffac0	392d3b0	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	642745	642745	0	0.0
			(read/write)	203848	203848	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197248	197248	0	0.0
			.comment	194	194	0	0.0
			.data	1480	1480	0	0.0
			.debug_abbrev	933099	933099	0	0.0
			.debug_aranges	87608	87608	0	0.0
			.debug_frame	301328	301328	0	0.0
			.debug_info	20302987	20302988	1	0.0
			.debug_line	2679748	2679748	0	0.0
			.debug_loc	2824679	2824679	0	0.0
			.debug_ranges	286200	286200	0	0.0
			.debug_str	3039406	3039406	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	104289	104289	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	377422	377422	0	0.0
			.symtab	256768	256768	0	0.0
			.text	536336	536336	0	0.0
mbed	lock-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2465472	2465472	0	0.0
			.bss	215964	215964	0	0.0
			.data	5880	5880	0	0.0
			.text	1428116	1428116	0	0.0
nrfconnect	all-clusters-app	nrf52840dk_nrf52840	(read only)	4	4	0	0.0
			(read/write)	1173596	1173596	0	0.0
			bss	155557	155557	0	0.0
			rodata	132652	132652	0	0.0
			text	804616	804616	0	0.0
	all-clusters-minimal-app	nrf52840dk_nrf52840	(read only)	4	4	0	0.0
			(read/write)	1118828	1118828	0	0.0
			bss	154713	154713	0	0.0
			rodata	109468	109468	0	0.0
			text	774004	774008	4	0.0
	all-clusters-app	nrf7002dk_nrf5340_cpuapp	(read only)	4	4	0	0.0
			(read/write)	1433604	1433604	0	0.0
			bss	135297	135297	0	0.0
			rodata	228692	228692	0	0.0
			text	775536	775536	0	0.0
qpg	lighting-app	qpg6105+debug	(read/write)	1153440	1153440	0	0.0
			.bss	97404	97404	0	0.0
			.data	852	852	0	0.0
			.text	600536	600536	0	0.0
	lock-app	qpg6105+debug	(read/write)	1122048	1122048	0	0.0
			.bss	92540	92540	0	0.0
			.data	856	856	0	0.0
			.text	569148	569148	0	0.0