scripts: move gen_offset_header.py to scripts/build/

Move scripts needed by the build system and not designed to be run
individually or standalone into the build subfolder.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

CMakeLists.txt

@@ -797,7 +797,7 @@ add_dependencies(zephyr_interface
 
 add_custom_command(
   OUTPUT ${OFFSETS_H_PATH}
-  COMMAND ${PYTHON_EXECUTABLE} ${ZEPHYR_BASE}/scripts/gen_offset_header.py
+  COMMAND ${PYTHON_EXECUTABLE} ${ZEPHYR_BASE}/scripts/build/gen_offset_header.py
   -i $<TARGET_OBJECTS:${OFFSETS_LIB}>
   -o ${OFFSETS_H_PATH}
   DEPENDS

doc/build/cmake/index.rst

@@ -356,10 +356,10 @@ The following is a detailed description of the scripts used during the build pro
 
 .. _gen_offset_header.py:
 
-:zephyr_file:`scripts/gen_offset_header.py`
+:zephyr_file:`scripts/build/gen_offset_header.py`
 -------------------------------------------
 
-.. include:: ../../../scripts/gen_offset_header.py
+.. include:: ../../../scripts/build/gen_offset_header.py
    :start-after: """
    :end-before: """