Various softmmu objects aren't target specific. Move them
to the generic softmmu source set.

For our 31 softmmu targets, this is in total 330 objects
less to build!

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20220207075426.81934-22-f4bug@amsat.org>