[nrfconnect] Added mode allowing to send new Cert. Decl. in OTA DFU (p…

…roject-chip#20609)

It is still not agreed if certification declaration that is part
of a firmware will be allowed to change after certification.
It might happen that the CD will need to be changed some other
way than modifying the firmware.

* Added config option allowing to enable certification declaration
storage.
* Added handler that is able to read CD from OTA DFU image
and save it in the Zephyr settings.
* Added nRFConnect define to set the Certification Declaration
value and not use the hardcoded one.

config/nrfconnect/chip-module/Kconfig

@@ -283,4 +283,24 @@ config CHIP_DEVICE_ENABLE_KEY
 	  This value is used during Certification Tests,
 	  and should not be present on production devices.
 
+config CHIP_CERTIFICATION_DECLARATION_STORAGE
+	bool "Enable storing Certification Declaration"
+	depends on CHIP_FACTORY_DATA
+	help
+	  Enables storing Certification Declaration in Zephyr settings
+	  instead of using hardcoded value from firmware. It also adds
+	  support for including new Certification Declaration into a firmware
+	  update image package sent via OTA Software Update.
+
+if CHIP_CERTIFICATION_DECLARATION_STORAGE
+
+config CHIP_CERTIFiCATION_DECLARATION_OTA_IMAGE_ID
+	int "Certification declaration OTA image id"
+	default 205 #0xcd
+	help
+	  The image id of Certification Declaration image
+	  for sending it via OTA Software Update purposes.
+
+endif
+
 endif