hw/remote: Add missing include

Currently "qemu/error-report.h" is implicitly included, however
if headers in include/ get refactored, we get:

  hw/remote/proxy-memory-listener.c: In function ‘proxy_memory_listener_commit’:
  hw/remote/proxy-memory-listener.c:183:9: error: implicit declaration of function ‘error_report’; did you mean ‘error_report_err’? [-Werror=implicit-function-declaration]
    183 |         error_report("Number of fds is more than %d", REMOTE_MAX_FDS);
        |         ^~~~~~~~~~~~
        |         error_report_err

Add the missing "qemu/error-report.h" header to avoid that.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220207082756.82600-3-f4bug@amsat.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>

hw/remote/proxy-memory-listener.c

@@ -16,6 +16,7 @@
 #include "exec/cpu-common.h"
 #include "exec/ram_addr.h"
 #include "qapi/error.h"
+#include "qemu/error-report.h"
 #include "hw/remote/mpqemu-link.h"
 #include "hw/remote/proxy-memory-listener.h"