epoll: drop struct epoll_event definition

Add kernel header sanitizer check to drop struct epoll_event.
This struct epoll_event is not following the POSIX standard
and defining element in opaque data type.

Change-Id: I1eecef1b64eb1fb8f0dd6999263093a453e7b9fb
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>