Preopt APEX system server jars from prebuilts.

Similar to the previous CL, but for jars from prebuilts.

Test: manual - 1. Patch aosp/1818020 and aosp/1810840.
  2. m SOONG_CONFIG_art_module_source_build=false com.android.art
Bug: 194150908
Change-Id: Idc0c73a78045a602ad3a91cb5071d291bd611015