tcg: Expand missing rotri with extract2

Use extract2 to implement rotri.  To make this easier,
redefine rotli in terms of rotri, rather than the reverse.

Reviewed-by: Jim MacArthur <jim.macarthur@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20260303010833.1115741-5-richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>