chore: Make any platforms acceptable in CPU template test

It's not necessary at the moment, but we will want to test new platform
(new Amazon Linux) in the future by injecting via --platforms arg.

Signed-off-by: Takahiro Itazuri <[email protected]>

Author: zulinx86

.buildkite/pipeline_cpu_template.py

@@ -27,14 +27,12 @@ class BkStep(str, Enum):
         ],
         BkStep.LABEL: "📖 rdmsr",
         "instances": ["c5n.metal", "m5n.metal", "m6a.metal", "m6i.metal"],
-        "platforms": DEFAULT_PLATFORMS,
     },
     "fingerprint": {
         BkStep.COMMAND: [
             "tools/devtool -y test --no-build -- -m no_block_pr integration_tests/functional/test_cpu_template_helper.py -k test_guest_cpu_config_change",
         ],
         BkStep.LABEL: "🖐️ fingerprint",
-        "platforms": DEFAULT_PLATFORMS,
     },
     "cpuid_wrmsr": {
         "snapshot": {