drm/xe: Remove redundant [drm] tag from xe_assert() message

Since commit 178c0a33 ("drm/print: Add generic drm dev printk
function") the output from drm_WARN() includes previously missing
the [drm] tag, so now xe_assert() is printing it twice:

  [ ] xe 0000:00:02.0: [drm] [drm] Assertion `false` failed!

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240902190726.1748-1-michal.wajdeczko@intel.com