Sandbox pdl genrules

Like in aosp/2825629, these genrules right the command used to
generate their files to the files themselves, which differs between
sandboxed/non-sandboxed invocations and caused genrule_sandbox_test.py
to think that sandboxing caused meaningful differences.

Bug: 307824623
Test: Presubmits
Change-Id: I248de8a45ab03a498297a026250d6f0b7c838e25