Currently, driver creates the NDI upon userspace request and sends
NDI-create-response to userspace. But internal NDI state is set
after sending this response. This leads to a race condition when
userspace sends NDI delete while driver is still setting driver
internal state for NDI create.
So, send NDI create response to userspace only after completion
of driver internal processing.
Change-Id: Ic651fd4f6dfab17c48c4f65b6e5d49c4d08cbe16
CRs-Fixed: 2966549
1663527e35