cmake: move the BOARD variable watch below deprecated board handling

Fixes: zephyrproject-rtos#33138

Board alias and deprecated board handling is setting the BOARD variable
after zephyr_boilerplate_watch(BOARD) has been executed.

This results in the board changed warning.

This commit moves the zephyr_boilerplate_watch(BOARD) code below the
board alias and deprecation handling.

Signed-off-by: Torsten Rasmussen <[email protected]>

Author: tejlmand

cmake/app/boilerplate.cmake

@@ -224,8 +224,6 @@ if(NOT (REVISION_SEPARATOR_INDEX EQUAL -1))
   string(SUBSTRING ${BOARD} 0 ${REVISION_SEPARATOR_INDEX} BOARD)
 endif()
 
-zephyr_boilerplate_watch(BOARD)
-
 set(BOARD_MESSAGE "Board: ${BOARD}")
 
 if(DEFINED ENV{ZEPHYR_BOARD_ALIASES})
@@ -243,6 +241,8 @@ if(${BOARD}_DEPRECATED)
   message(WARNING "Deprecated BOARD=${BOARD_DEPRECATED} name specified, board automatically changed to: ${BOARD}.")
 endif()
 
+zephyr_boilerplate_watch(BOARD)
+
 foreach(root ${BOARD_ROOT})
   # Check that the board root looks reasonable.
   if(NOT IS_DIRECTORY "${root}/boards")