tests/tcg/aarch64: Use stz2g in mte-7.c

We have many other instances of stg in the testsuite;
change these to provide an instance of stz2g.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20230530191438.411344-19-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
1 file changed