dwc_otg: make channel halts with unknown state less damaging

If the IRQ received a channel halt interrupt through the FIQ
with no other bits set, the IRQ would not release the host
channel and never complete the URB.

Add catchall handling to treat as a transaction error and retry.

Source: https://dev.openwrt.org/browser/branches/barrier_breaker/target/linux/brcm2708/patches-3.10/0084-dwc_otg-make-channel-halts-with-unknown-state-less-d.patch?rev=42682

Google-Bug-Id: 23325978
Change-Id: I87e827944ae055260277f749e30d48d1ff4c240f
1 file changed