Revert "libdexfile_external is replaced by libdexfile (reland)."

Revert "Merge libdexfile_external into libdexfile (reland)."

Revert "Rename libdexfile_external_static to libdexfile_static (..."

Revert "Rename libdexfile_external_static to libdexfile_static (..."

Revert submission 1666119-libdexfile-noext-2

Reason for revert: broken build 7270939 on aosp-master on full-eng
Reverted Changes:
I582e49ae7:Merge libdexfile_external into libdexfile (reland)...
Iaa6a90f41:Rename libdexfile_external_static to libdexfile_st...
I4315189b2:libdexfile_external is replaced by libdexfile (rel...
Ia065119c2:Rename libdexfile_external_static to libdexfile_st...

Bug: 184929782
Change-Id: Id4830ded68e6fb3e9da0bcd8e428c46a79df3ff8
Test: forrest build for aosp-master on full-eng