intel: genxml: compress all gen files into one

intel: genxml: compress all gen files into one

Combining all the files into a single string didn't make any
difference in the size of the aubinator binary.

With this change we now also embed gen4/4.5/5 descriptions, which
increases the aubinator size by ~16Kb.

v2 (Lionel): rebase makefiles

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>