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: I0e1b5ff0e9970a40ad9d0619dcb7f8cbae241656
Signed-off-by: Sarada Prasanna Garnayak <sgarna@codeaurora.org>