mmc: card: Kill block requests if card is removed

Kill block requests when the host realizes that the card is
removed from the slot and is sure that subsequent requests
are bound to fail. Do this silently so that the block
layer doesn't output unnecessary error messages.

Change-Id: I25e29ac2fdab999d506ef722966a4725ea584c83
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
[sthumma@codeaurora.org: Fixed merge conflicts]
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>