usb: gsdio: Drop the carrier detect when sdio device is removed

USB DUN(dial-up networking) driver communicates to modem over
sdio. When sdio platform device is removed, drop the carrier
detect(CD) signal to indicate call drop to USB host(laptop).
One instance where sdio platform device can be removed is when
modem sub-system restart is initiated.

CRs-Fixed: 294871
Signed-off-by: Vamsi Krishna <vskrishn@codeaurora.org>
1 file changed