find7: update products makefile

Change-Id: Ia0e46692d7f96e1e97713eb6da49b4a72c025538
find7: fix "PRODUCT_GMS_CLIENTID_BASE"

Change-Id: I37051bc3cbc0fd7937f5d60c3d35e932d8817f60
find7: fix for approved GMS identifiers

Change-Id: I23408839cb941f514e8189f06c964daf4b07f26f
find7: keep pa related build_prop overrides

Change-Id: Ie423981b8e9be81a2925a8779d302bd6e004fe22