Do not enable host APEX explicitly for linux_bionic.

It overrides the global enable flag that is controlled through the
Soong variable.

Test: env TARGET_PRODUCT=aosp_cf_arm_only_phone \
      TARGET_BUILD_VARIANT=eng m nothing
Bug: 172480615
Change-Id: If389bc5eb8feffadb46195261d8eb6792c6875df
1 file changed