[jdk11u-dev] RFR: 8256182: Update qemu-debootstrap cross-compilation recipe

[Aleksey Shipilev]

Unclean backport to improve cross-build implementation. The uncleanliness comes from the fact that 11u builds are in `linux-aarch64-*normal*-server-release`, so the hunks do not apply cleanly. I just accepted the hunks from the mainline patch and added "normal" manually.

Original change was to match the docs with what we run in GHA. The same motivation holds for 11u.

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Commit messages:
 - Backport 421a7c3b41343e60d52b6d9ee263dfd0a4d53ce1

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/589/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=589&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256182
  Stats: 46 lines in 2 files changed: 29 ins; 0 del; 17 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/589.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/589/head:pull/589

PR: https://git.openjdk.java.net/jdk11u-dev/pull/589