Disable cdex at build time.

Code cleanup will come later.

Test: banchan com.android.art && m
Test: atest art_dexlayout_tests art_dexdiag_tests \
        art_standalone_dex2oat_tests art_standalone_dex2oat_cts_tests
Bug: 256664509
(cherry picked from https://android-review.googlesource.com/q/commit:fa41df028f28e8f71f0e06ccc6b97c6a099b5bba)
Merged-In: I3079ba4d4d09ca5edbd30593210451eebf98b924
Change-Id: I3079ba4d4d09ca5edbd30593210451eebf98b924