Package dexpreopt artifacts for libcore jars in the ART apex.

This patchset removes the obsolete preinstall hook that was used to
run dex2oat to dexpreopt bootclasspath jars when installing the apex
on device.

Instead, this patchset adds precompiled dexpreopt files for the
libcore part of bootclasspath in the apex. See the related patch in
build/soong.

The dexpreopt files are packaged in dexpreopt/$ARCH/ subdirectory
and have names prefixed with 'boot-art'.

Test: m
Test: m com.android.art deapexer \
    && find $ANDROID_BUILD_TOP -type f -name 'com.android.art.*.apex \
        | xargs deapexer | grep boot \
    Expect to find dexpreopt/$ARCH/boot-art*.{art,oat,vdex} files.
Test: art/build/apex/runtests.sh

Change-Id: I52a9a4d726d0da5a1cc52644351275cd3bb0f0d3

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