mmc: sdhci: add err_state to sdhci_dumpregs func

This change sets err_state in sdhci_dumpregs func indicating
driver errors captured, which can be read out from debugfs.

CRs-Fixed: 1056483
Change-Id: If6323f4e2cf9c835139ea92753ae8407709b8a70
Signed-off-by: Liangliang Lu <luliang@codeaurora.org>
Signed-off-by: Siba Prasad <sibap@codeaurora.org>