net: cnss: remove redundant and dead code from platform driver

The cnss subsystem restart and pm qos export API has been
refactor in respective platform driver according to the bus
type SDIO/PCIe.

Remove redundant and dead code from platform driver to avoid
the namespace collision compilation error. Refactor the recovery
work handler according to bus type. This feature adds support for
dual cnss platform driver support for dual WiFi.

CRs-Fixed: 987560
Change-Id: I4aba605e28452a82d3260c672f22e39bf8f169ab
Signed-off-by: Sarada Prasanna Garnayak <sgarna@codeaurora.org>