target/arm: Split zdn in do_z2z_n1 and do_z2z_n1_fpst

Rename from z2z to zzz to indicate zd and zn may not overlap.
During decode, retain z2z name and duplicate the same field
into zd and zn.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20260826174213.614571-2-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 files changed