mmc: SDHCI: add some additional messages for SDHCI driver to dump

mmc: SDHCI: add some additional messages for SDHCI driver to dump

BZ: 9241

Add some additional debug messages in sdhci_dumpregs for debug purpose.
With this messages, it will be easily to identify what is going on
in driver when we encounter some issue.

Change-Id: I93eb910b808b485536dfd9882d668b4e284cdd28
Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Reviewed-on: http://android.intel.com:8080/23126
Reviewed-by: Gross, Mark <mark.gross@intel.com>
Tested-by: Gross, Mark <mark.gross@intel.com>