audiopolicy: engineconfigurable: prevents typo on strategy structure file

This CL allows to generate at build time the ProductStrategy structure
file to ensure it is aligned with audio policy engine configuration file.

Bug: 124767636
Test: build

Change-Id: I1afba9602482a898147c685d4a8b03fbe99c08b1
Signed-off-by: Francois Gaffie <francois.gaffie@renault.com>