drm/xe/tests: Use uninterruptible VM lock

Interruptible lock can return error and needed a return value
check. This test should finish quick enough so use a uninterruptible
lock instead.

Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240521102715.22700-1-nirmoy.das@intel.com


Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>