Remove reference to dockerhost-rise-ubuntu2204-aarch64-1

[luhenry]

Fixes adoptium/infrastructure#3427

cc @sxa @gdams

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[sxa]

We'll need to make sure we have a suitable alternative. The physical machines (Scaleway+PLCTLAB) out of the box will give the ICACHE error when running in our build container:

17:05:42  [SUCCESS] Executing local file at /home/jenkins/workspace/build-scripts/jobs/jdk21u/jdk21u-linux-riscv64-temurin/build-farm/platform-specific-configurations/linux.sh
17:05:42  BOOT JDK: [0.028s][error][os] Syscall: RISCV_FLUSH_ICACHE not available; error='Operation not permitted' (errno=EPERM)
17:05:42  BOOT JDK: Error occurred during initialization of VM
17:05:42  BOOT JDK: Unable to synchronize I-cache

While I appreciate that I'm blocking this today when we're in a broken situation, as an interim solution I'm more tempted to have this running with a straight switch of the rise hostname for dockerhost-azure-ubuntu2204-x64-1 which works, but I think it makes sense to add in a qemustatic label that we can use for this going forward and attach that to the machines listed in my table in the related issue. I'll give that some consideration tomorrow, but as-is I don't believe this will allow us to continue building as there is a lack of suitable machines.

[sxa]

Closing this as the other PR solves it in a better way. If there is any disagreement with this then we can reopen it :-)