zephyr: Allow external Sysbuild Kconfig root

Allows for modules to override the NCS Sysbuild Kconfig root

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

Author: nordicjm

modules/modules.cmake

@@ -11,6 +11,7 @@ set(ZEPHYR_OPENTHREAD_CMAKE_DIR ${CMAKE_CURRENT_LIST_DIR}/openthread)
 set(ZEPHYR_OPENTHREAD_KCONFIG ${CMAKE_CURRENT_LIST_DIR}/openthread/Kconfig)
 set(ZEPHYR_HAL_NORDIC_CMAKE_DIR ${CMAKE_CURRENT_LIST_DIR}/hal_nordic)
 set(ZEPHYR_NRF_KCONFIG ${CMAKE_CURRENT_LIST_DIR}/../Kconfig.nrf)
+set(SYSBUILD_NRF_KCONFIG ${CMAKE_CURRENT_LIST_DIR}/../sysbuild/Kconfig.sysbuild)
 
 # Those are modules with Kconfig tree's inside the module repo but where
 # nRF Connect SDK extend those trees.

zephyr/module.yml

@@ -4,6 +4,7 @@ build:
   kconfig-ext: true
   sysbuild-cmake: sysbuild
   sysbuild-kconfig: sysbuild/Kconfig.sysbuild
+  sysbuild-kconfig-ext: true
   settings:
     soc_root: .
     board_root: .