qtnfmac: enable reloading of qtnfmac kernel modules

This patch enables rmmod/insmod for qtnfmac kernel modules:
- do not 'pin' pci device in order to disable it on module unload
- implement card reset procedure
- restore PCI bar addresses for restarted wireless card

Signed-off-by: Sergei Maksimenko <smaksimenko@quantenna.com>
Signed-off-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>