astd: Change the bin paths to system_ext

Bug: 235020153
Test: Local build
Ignore-AOSP-First: The binaries are built only in factory image
Change-Id: I81e3b59dc7a73f1f8d29b215aee5d850fb0833a1
Merged-In: I960c09d0891403048cf448935dbd096a50794eae
2 files changed