RFR: 8328705: GHA: Cross-compilation jobs do not require build JDK

[Aleksey Shipilev]

Noticed this while fixing other GHA issues.

We pass build JDK to cross-compilation jobs, which makes them dependent on Linux-x64 builds. But we only build hotspot in all those jobs, so AFAICS there is no need for build JDK, and therefore no need for the dependency. Untying cross-compilation jobs from Linux-x64 builds make GHA more parallel. 

Additional testing:
 - [ ] GHA

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Commit messages:
 - Fix

Changes: https://git.openjdk.org/jdk/pull/18437/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18437&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328705
  Stats: 11 lines in 2 files changed: 0 ins; 10 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18437.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18437/head:pull/18437

PR: https://git.openjdk.org/jdk/pull/18437