[test][sagemaker][pytorch] Run smddp_smdmp test on correct region

[saimidu]

Issue #, if available:

PR Checklist

• I've prepended PR tag with frameworks/job this applies to : [mxnet, tensorflow, pytorch] | [ei/neuron] | [build] | [test] | [benchmark] | [ec2, ecs, eks, sagemaker]
• (If applicable) I've documented below the DLC image/dockerfile this relates to
• (If applicable) I've documented below the tests I've run on the DLC image
• (If applicable) I've reviewed the licenses of updated and new binaries and their dependencies to make sure all licenses are on the Apache Software Foundation Third Party License Policy Category A or Category B license list. See https://www.apache.org/legal/resolved.html.
• (If applicable) I've scanned the updated and new binaries to make sure they do not have vulnerabilities associated with them.

Reviewer Checklist

• For reviewer, before merging, please cross-check:

• I've verified the code change on the config file mentioned above has already been reverted

Description:
Undo fixture changes to force smddp+smdmp tests to run in us-east-1..

Tests run:

DLC image/dockerfile:

Additional context:

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license. I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.