[nrf noup] zephyr: Add RAM flash configuration to cache for sysbuild

Puts the flash simulation configurtion into cache variables that can
be used by other applications and CMake code to know specifics on
the simulated flash details

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>
Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>
(cherry picked from commit c19337f)
(cherry picked from commit 90a91e0)
Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>

boot/zephyr/CMakeLists.txt

@@ -525,3 +525,14 @@ zephyr_library_sources(
   ${BOOT_DIR}/zephyr/nrf_cleanup.c
 )
 endif()
+
+if(SYSBUILD AND CONFIG_PCD_APP)
+    # Sysbuild requires details of the RAM flash device are stored to the cache of MCUboot so
+    # that they can be read when running partition manager
+    dt_nodelabel(ram_flash_dev NODELABEL flash_sim0)
+    dt_reg_addr(ram_flash_addr PATH ${ram_flash_dev})
+    dt_reg_size(ram_flash_size PATH ${ram_flash_dev})
+
+    set(RAM_FLASH_ADDR "${ram_flash_addr}" CACHE STRING "" FORCE)
+    set(RAM_FLASH_SIZE "${ram_flash_size}" CACHE STRING "" FORCE)
+endif()