usb: rmnet_sdio: Handle SDIO MUX add/removal events

sdio mux channel can be removed/added anytime during an active
data call. When sdio mux channel is removed, free all buffers
and indicate data call disconnection to usb host(laptop). SDIO
channel can be removed during modem sub-system restart.
Also add additional debug counters.

CRs-Fixed: 294875
Signed-off-by: Vamsi Krishna <vskrishn@codeaurora.org>
1 file changed