Move generate xsd file to avoid requiring API Review

These APIs aren't actually used by anyone, these are generated from XSD
to help with back compat checks.
The XDS itself (not the generated Java APIs) is used in VTS.

Test: atest ValidateHalManifest (add max-level to
android.hardware.wifi.hostapd.xml first)
Bug: 353354885
(cherry picked from https://android-review.googlesource.com/q/commit:e52cce477752e6808a2bf03d09b7f2b8174304af)
Merged-In: I72a7ec51f13dc3e9167f06e2e1d13a0c85def9cb
Change-Id: I72a7ec51f13dc3e9167f06e2e1d13a0c85def9cb
5 files changed