Revert "wcnss: handle CBC complete event from firmware"

This reverts commit 7db9a1a9.
Above commit depends on firmware code changes, As new code
changes that would be introduced removes this dependency,
hence reverting this commit.

Change-Id: I86479d05f98e48949a140e30efae4e311e1cbf00
CRs-Fixed: 744296
Signed-off-by: Anand N Sunkad <asunka@codeaurora.org>