mmc: sdhci: propagate error to command queue engine

eMMC controller detects error, generates error interrupt and
notifies the CQE. Hence, parse the correct error and propagate
it to CQE handler for further processing.

Command queue interrupt handler may return IRQ_NONE
or IRQ_HANDLED. Check for the return value and either
proceed or return from handler.

Change-Id: I29c7b22848d3d728a79ba215f8d2f594d19fba63
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>