mmc: sdhci: add auto command error interrupt support

The auto command error interrupt is not enabled now. Hence,
if there occurs a timeout when auto-cmd is in progress,
no data timeout interrupt would occur and the driver would
only timeout after the software timer expires.

This patch enables the auto command error interrupt and lets the
higher layers know of such an error, if any.

CRs-Fixed: 515513
Change-Id: I69880a72ece7730645dcfe699d58271d60cab33d
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Krishna Konda <kkonda@codeaurora.org>
[xiaonian@codeaurora.org: fix trivial merge conflict]
Signed-off-by: Xiaonian Wang <xiaonian@codeaurora.org>