Optionally include afdo_profiles.mk if available

Previously, the product var is defined in pixel product config only. This breaks SDK finalization for udc (google3/configs/wireless/android/busytown/platform/git_udc/git_udc-release.gcl). In SDK finalization, we need to ensure performance/usage of libraries are consistent across all builds that don't set SKIP_ABI_CHECKS.

This CL optionally includes the afdo_profiles if available so that afdo is on all products by default.

Ignore-AOSP-First: The topic has internal-only CLs
Test: CI
Bug: 276672785
Change-Id: I2cc51412de141c4e6ad69f49cef378121e0b3b87
Merged-In: I2cc51412de141c4e6ad69f49cef378121e0b3b87