cmake: NUTTX_COMMON_DIR must be set after .config definitions are included

otherwise NUTTX_COMMON_DIR is empty if CONFIG_ARCH_BOARD_COMMON is set from menuconfig

Co-authored-by: hartmannathan <59230071+hartmannathan@users.noreply.github.com>
diff --git a/CMakeLists.txt b/CMakeLists.txt
index efddcd1..80f0342 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -262,15 +262,6 @@
   file(TOUCH ${CMAKE_BINARY_DIR}/drivers/platform/Kconfig)
 endif()
 
-# board common directory
-
-if(CONFIG_ARCH_BOARD_COMMON)
-  file(
-    GLOB NUTTX_COMMON_DIR
-    LIST_DIRECTORIES true
-    "${NUTTX_DIR}/boards/${CONFIG_ARCH}/${CONFIG_ARCH_CHIP}/common")
-endif()
-
 # Custom chip ###################################################
 
 if(CONFIG_ARCH_CHIP_CUSTOM)
@@ -388,6 +379,15 @@
 
 set(FETCHCONTENT_QUIET OFF)
 
+# Board common directory #####################################################
+
+if(CONFIG_ARCH_BOARD_COMMON)
+  file(
+    GLOB NUTTX_COMMON_DIR
+    LIST_DIRECTORIES true
+    "${NUTTX_DIR}/boards/${CONFIG_ARCH}/${CONFIG_ARCH_CHIP}/common")
+endif()
+
 # Setup toolchain ############################################################
 
 # This needs to happen before project() when binaries are searched for