sysbuild: add thingy91x board

This patch adds the thingy91x board to the sysbuild overrides.

Signed-off-by: Maximilian Deubel <maximilian.deubel@nordicsemi.no>

Author: maxd-nordic

sysbuild/CMakeLists.txt

@@ -102,6 +102,8 @@ function(${SYSBUILD_CURRENT_MODULE_NAME}_pre_cmake)
     set(board_secure nrf9160dk_nrf9160)
   elseif(BOARD STREQUAL "thingy91_nrf9160_ns")
     set(board_secure thingy91_nrf9160)
+  elseif(BOARD STREQUAL "thingy91x_nrf9151_ns")
+    set(board_secure thingy91x_nrf9151)
   elseif(BOARD STREQUAL "nrf5340dk_nrf5340_cpuapp_ns")
     set(board_secure nrf5340dk_nrf5340_cpuapp)
   elseif(BOARD STREQUAL "thingy53_nrf5340_cpuapp_ns")