usb: rmnet_sdio: Start IO only when USB and SDIO are available

Allocate and Queue USB buffers only when USB and SDIO transports
are available. This change would add flexibility to clean-up
driver state when one of the transports(usb/sdio) is removed or
added.

Signed-off-by: Vamsi Krishna <vskrishn@codeaurora.org>
1 file changed