[nrf fromtree] soc: nordic: uicr: print cmake warning when used without sysbuild

Because generation and programming of UICR + PERIPHCONF artifacts
depend on the 'uicr' image which in turn must be included by Sysbuild,
many if not most nrf54h20 applications will need to be built using
Sysbuild to function as intended.

To make this known to the user, print a CMake warning whenever
CONFIG_NRF_PERIPHCONF_SECTION=y but Sysbuild is not being used.

Signed-off-by: Jonathan Nilsen <[email protected]>
(cherry picked from commit 6b93eac)

Author: jonathannilsen

soc/nordic/common/uicr/CMakeLists.txt

@@ -20,3 +20,11 @@ if(CONFIG_NRF_PERIPHCONF_GENERATE_ENTRIES)
   zephyr_sources(${periphconf_entries_c_file})
   message(STATUS "Generated ${periphconf_entries_c_file} from ${EDT_PICKLE}")
 endif()
+
+if(CONFIG_NRF_PERIPHCONF_SECTION AND NOT SYSBUILD)
+  message(WARNING "CONFIG_NRF_PERIPHCONF_SECTION is enabled, but Sysbuild is not being used. "
+                  "The global peripheral configuration will not be applied unless artifacts "
+                  "are generated manually/externally. To enable automatic generation, build with "
+                  "Sysbuild and ensure that SB_CONFIG_NRF_HALTIUM_GENERATE_UICR=y."
+  )
+endif()