SDMMC databook specifies that when an error interrupt is generated
(such as RTO, DCRC, RCRC), CMD_DONE interrupt is also generated.
The code used to break out of the event handling loop to wait for
another interrupt event to happen, reporting CMD_DONE.
However if interrupt processing was delayed, it is possible that
a single event contains both RTO and CMD_DONE. Previously, CMD_DONE
would not be handled, and the state machine would be stuck in
SDMMC_SENDING_CMD state, until a timeout. This didn't change the
outcome (err=0x107), but delayed the handling of response timeout
event.
Fix by not breaking out of the event handler, optionally processing
the CMD_DONE interrupt if it has been reported in the same message.
6782971332