CNSS Platform driver (for PCIe WLAN module)

This platform driver adds support for the CNSS connectivity subsystem
used for PCIe based wifi devices. This driver also adds support to
integrate PCIe WLAN module to subsystem restart framework.

CRs-fixed: 565890
Change-Id: I90a3c637f5bb1e55189f31b796e4b1795e613f89
Signed-off-by: David Tay <dtay@codeaurora.org>
Signed-off-by: Sameer Thalappil <sameert@codeaurora.org>