start: Toggle iorapd on/off when using 'start' command (by itself)

iorapd depends on pm in system_server, so turn it off too when we
turn off system_server with the 'stop' command.

Bug: 153964298
Test: adb shell stop
Test: adb shell start
Change-Id: I08390472b1e1b969d0380843efa1bbd35b194250