mmc: core: Detect card removal on I/O error

To prevent I/O as soon as possible at card removal, a new
detect work is re-scheduled without a delay to let a rescan
remove the card device as soon a possible.

Additionally, MMC_CAP2_DETECT_ON_ERR can now be used to handle
"slowly" removed cards that a scheduled detect work did not
detect as removed. To prevent further I/O requests for these
lingering removed cards, check if card has been removed and then
schedule a detect work to properly remove it.

Change-Id: Iec07260ad51fbe66dc5c54393579b65137d08ad1
Signed-off-by: Ulf Hansson <ulf.hansson@stericsson.com>
[subhashj@codeaurora.org: Fixed merge conflicts]
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>