Clean up mainline whitelist in aosp_product.mk

Bug: 138281437
Bug: 140912362
Test: for prod in aosp_bonito aosp_arm64 aosp_cf_x86_phone ; do \
        lunch ${prod}-userdebug \
        m -j100 nothing || exit 1 \
      done

Change-Id: I2bc1f49ce68e49313e5c00104aad7b21a101ca7a