doxygen: fixed relative path to doxygenlayout.xml

Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

doxy/Doxyfile.in

@@ -681,7 +681,7 @@ FILE_VERSION_FILTER    =
 # DoxygenLayout.xml, doxygen will parse it automatically even if the LAYOUT_FILE
 # tag is left empty.
 
-LAYOUT_FILE            = @CMAKE_CURRENT_SOURCE_DIR@/DoxygenLayout.xml
+LAYOUT_FILE            = @CMAKE_CURRENT_SOURCE_DIR@/doxy/DoxygenLayout.xml
 
 # The CITE_BIB_FILES tag can be used to specify one or more bib files containing
 # the reference definitions. This must be a list of .bib files. The .bib