[Bouffalolab]improvements related to ota requestor

[stoneM2017]

This PR contains the improvements we added to the ota requestor for bouffalo lab platform, for both bl602 and bl702.
Detailed changes including:

1. init ota requestor after got IPV6 address or thread attached, in order to ensure the the NotifyUpdateApplied message can be sent successfully.
2. sync-up ota related API changes in bl_iot_sdk.
   hosal_ota_finish() is depreciated and 3 new APIs are added: hosal_ota_check(), hosal_ota_apply() and hosal_ota_abort().
3. make the ota auto reboot delay configureable.
4. update bl_iot_sdk, commit id 7ca85fd7.

[github-actions]

PR #26013: Size comparison from d85124e to 792d17a

Full report (1 build for cc32xx)

platform	target	config	section	d85124e	792d17a	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	642953	642953	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	933129	933129	0	0.0
			.debug_aranges	87616	87616	0	0.0
			.debug_frame	301352	301352	0	0.0
			.debug_info	20303347	20303347	0	0.0
			.debug_line	2679969	2679969	0	0.0
			.debug_loc	2824782	2824782	0	0.0
			.debug_ranges	286208	286208	0	0.0
			.debug_str	3039567	3039567	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	104353	104353	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	377533	377533	0	0.0
			.symtab	256800	256800	0	0.0
			.text	536480	536480	0	0.0