build: support for AOSD product builds (EXPERIMENT)
note:
 - adapted from CM for AOSD use

If building a aosd_* product, skip crawling the filesystem for
AndroidProduct makefiles (and, of course, parsing their contents)
and aim directly for the vendor/AOSD/products/<product> device configuration

Change-Id: I2a5e70dda973a6fcdbba0d5e26b35b99d3f1aea2
Signed-off-by: CNBLACK <didwjdgns21@gmail.com>