Provide workaround for SPDK issue 2683, AMD iommu support

[krehm]

In SPDK issue 2683, SPDK incorrectly determines that an AMD iommu does not support virtual addressing. As a result, DAOS engines cannot run as non-root on an AMD server. Change DAOS to specify iova_mode = "va" when calling spdk_env_init() when running as non-root. This is a workaround until SPDK issue 2683 is fixed.

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[github-actions]

Errors are component not formatted correctly,Ticket number prefix incorrect,PR title is malformatted. See https://daosio.atlassian.net/wiki/spaces/DC/pages/11133911069/Commit+Comments,Unable to load ticket data
https://daosio.atlassian.net/browse/Provide

[tanabarr]

LGTM, adding @NiuYawei and @jolivier23 who have had exposure to this kind of issue before.

[johannlombardi]

Thanks @krehm. Tested on my AMD node and it works.