Split PRODUCT_AFDO_PROFILES into two variables

Currently, PRODUCT_AFDO_PROFILES is generally applied to all products and is not semantically treated as a product config varilable.

Splitting this allows us:
1. Explicitly tell that PRODUCT_AFDO_PROFILES takes precedence over product-agnostic profiles in AFDO_PROFILES
2. Add PRODUCT_AFDO_PROFILES to _product_vars_list

Test: Define PRODUCT_AFDO_PROFILES in a product config and make sure it appears first in the soong var AfdoProfiles
Bug: 277215393
Change-Id: I284f6308d456994bb72129cb0d7be7cd091993ae
Merged-In: I284f6308d456994bb72129cb0d7be7cd091993ae