hw/ide: drop a redundant interrupt from INITIALIZE DEVICE PARAMETERS

ide_bus_exec_cmd() raises the interrupt for every command handler that reports the command complete, which cmd_specify() does, so the request it raised itself was the first of two. The one from ide_bus_exec_cmd() is the one that belongs there, being raised after BSY is cleared and after ide_cmd_done() has let the bus master post its own completion. Cc: John Snow <jsnow@redhat.com> Cc: Peter Maydell <peter.maydell@linaro.org> Cc: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com> Signed-off-by: Denis V. Lunev <den@openvz.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>