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anv: disable VK_EXT_calibrated_timestamps when the timestamp register is unreadable

Eric Engestrom requested to merge eric/mesa:gen12-sriov-anv into master

When running in a virtual context, the timestamp register is unreadable on Gen12+.

While we could work around this, that would result in very inaccurate results for an extension where the whole point is accuracy, so let's just disable the extension.

/cc @llandwerlin @jekstrand @jljusten

Edited by Eric Engestrom

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