waffle utils: add Android.mk

This should allow wflinfo to get built for android.

v2 (chadv): Fix LOCAL_C_INCLUDES, as pointed out by Juha-Pekka.

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Signed-off-by: Chad Versace <chad.versace@linux.intel.com>
Tested-by: Juha-Pekka Heikkilä <juha-pekka.heikkila@linux.intel.com>