treewide: Remove child/parent image support

Removes support for child/parent image

Signed-off-by: Jamie McCrae <[email protected]>

Author: nordicjm

CMakeLists.txt

@@ -24,7 +24,6 @@ endforeach()
 include(cmake/extensions.cmake)
 include(cmake/version.cmake)
 include(cmake/version_app.cmake)
-include(cmake/multi_image.cmake)
 include(cmake/sdp.cmake)
 
 zephyr_include_directories(include)

Kconfig.nrf

@@ -28,12 +28,6 @@ endif # BUILD_WITH_TFM
 
 menu "Nordic nRF Connect"
 
-# Hides child parent configuration options
-config HIDE_CHILD_PARENT_CONFIG
-	bool
-	default y if "$(HIDE_CHILD_PARENT_CONFIG)" = "True"
-	default n
-
 # Override configuration from zephyr which sets this to 0x200 if MCUboot is
 # enabled (CONFIG_BOOTLOADER_MCUBOOT), since NCS use partition_manager to
 # get this offset intsead.