Use RRO for product-specific resources

Currently PackageInstaller is compiled differently, depending on the
product (tv / tablet) to select product-specific resources. That causes
divergence of system.img among targets.

Setting generate_product_characteristics_rro will automatically
generate an RRO package which contains resources having
product="{PRODUCT_CHARACTERISTICS}"'. The RRO package will be
installed to /product partition. PackageInstaller will instead be
compiled with '--product default', making system.img identical to all
targets. This also reduces complexity and duplicates of Android.bp.

Bug: 325011777
Test: boot and idmap2 dump
Change-Id: Ie345dd112a66bfd0d26d3b59a47bc2d982fe42c1