cnss: add support for pinctrl framework to configure the wlan gpio

Currently the wlan gpios are configured by both gpio library API and
pinctrl framework. The gpio has to be configured either by using kernel
gpio library API or pinctrl framework not both.

Remove gpio library support from cnss PCIE platform driver to configure
the wlan gpio. Add pinctrl framework to configure the wlan enable and
bootstrap gpio.

CRs-Fixed: 1040537
Change-Id: Id30241dea936300f5d5502ca0a249e20403c4b63
Signed-off-by: Sarada Prasanna Garnayak <sgarna@codeaurora.org>