Add PRODUCT_IGNORE_ALL_ANDROIDMK to ignore Android.mk files

PRODUCT_ALLOWED_ANDROIDMK_FILES can be used for products that still have some Android.mk files that need to be included.

PRODUCT_ANDROIDMK_ALLOWLIST_FILE can be used to allowlist Android.mk files that are not in AOSP.

Bug: 318428689
Test: lunch aosp_cf_x86_64_phone-trunk_staging-eng && m
Test: CIs
Change-Id: Ie64040608c795a949e3d7af45f176209c6d01d9a