cnss: Add wrapper for CPU affinity change

This API will be used by WLAN driver to bind the thread
to a cpu.

CRs-Fixed: 563040
Change-Id: Iea178e764677ad7351578b37c0af6dbd005d6984
Acked-by: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
Signed-off-by: Sameer Thalappil <sameert@codeaurora.org>