Use erofs if RELEASE_APEX_USE_EROFS_PREINSTALLED

Changes the default payload type of preinstalled APEXes from ext4 to
erofs.

Bug: 380961055
Test: m com.android.runtime
     $ deapexer info --print-payload-type \
       $OUT/system/apex/com.android.runtime.apex
Change-Id: I376deb4babd837edec5ef85d18e217398cd7b01e