libdexfile_external is replaced by libdexfile (reland 2).

This relands https://r.android.com/1644045 after requisite fix in
https://r.android.com/1671709.

Test: atest CtsSimpleperfTestCases
Bug: 143978909
Change-Id: I89650a8059b56d2b35a5592ef555c91faa49a2cf
1 file changed