bsd-user, linux-user: introduce qemu_process_cpu_events

Add a user-mode emulation version of the function.  More will be
added later, for now it is just process_queued_cpu_work.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
25 files changed