Add DISK_IO_INIT to the list of kernel flags
Add DISK_IO_INIT to the list of kernel flags

In order to get disk I/O stack walks it is necessary to have the
DISK_IO_INIT kernel flag specified. A previous change was supposed
to add this but didn't - instead DISK_IO was added, but it was already
implied by LATENCY.

ariccio/UIforETW,u-engine/UIforETW,ariccio/UIforETW,MikeMarcin/UIforETW,MikeMarcin/UIforETW,mwinterb/UIforETW,ariccio/UIforETW,MikeMarcin/UIforETW,mwinterb/UIforETW,ariccio/UIforETW,u-engine/UIforETW,google/UIforETW,google/UIforETW,mwinterb/UIforETW,u-engine/UIforETW,google/UIforETW,google/UIforETW