qmp_command: fix issue of query block status while using q35 machine type

Q35 doesn't contain floppy block in the default, so added this patch
for delete floppy block while using q35 to test
Signed-off-by: Njinzhao <jinzhao@redhat.com>

qemu/tests/cfg/qmp_command.cfg

@@ -51,6 +51,8 @@
             post_cmd = info blockstats
             cmd_result_check = contain
             cmd_return_value = "device;wr_highest_offset;rd_bytes;wr_operations;rd_operations;wr_bytes;parent;floppy0;sd0"
+            q35:
+                cmd_return_value = "device;wr_highest_offset;rd_bytes;wr_operations;rd_operations;wr_bytes;parent;sd0"
             defaults = yes
         - qmp_memsave:
             event_cmd_type = host_cmd