SendEventNotification was handled through FIFO, now it is using doorbell to
communicate with hardware. Added Sleep Flag as an extra argument to support
Can-Sleep feature.  Resending patch including compilation error fix reviewed
by Grant Grundler.

Signed-off-by: Kashyap Desai <kadesai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>