android: intel: genxml: fix genX_xml.h generation rules
Recent changes in Makefile.sources merged the aubinator files in
a unique list of generated files and genxml/genX_xml.h is now needed
to avoid the following building error:
ninja: error: '.../genxml/genX_xml.h', needed by '.../genxml/genX_xml.h',
missing and no known rule to make it
build/core/ninja.mk:148: recipe for target 'ninja_wrapper' failed
Fixes: 0f83c05 "intel: genxml: compress all gen files into one"
Acked-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>