net: cnss: add unsafe channel list support for dual WiFi

Store WiFi unsafe Channel list and return to wlan host
driver on query. It adds support WiFi unsafe Channel list
for LTE-WiFi coexistence.

This export symbol supported by both SDIO and PCIe platform
driver. So add this API as a common API for both SDIO and PCIe
interface based wlan module and remove the duplicate API from
the SDIO and PCIe platform driver.

CRs-Fixed: 983607
Change-Id: I1698df3fb689ef17294e00032adde5ae635e76de
Signed-off-by: Sarada Prasanna Garnayak <sgarna@codeaurora.org>