drm/i915/gt: Remove unneeded semicolon

The semicolon after the `}' is unneeded.

Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
[Removed line mention when pushing]
Link: https://patchwork.freedesktop.org/patch/msgid/20220716184439.72056-1-wangborong@cdjrlc.com