mmc: host: Add cmdq hci functions for error handling

Add support to decode the register information stored in
errored mrqs. The higher layers can use them to decode the error
information related to hardware and use them to make decisions during
error handling.

Change-Id: I61d739a4976ebdd4ae2b0f745b93c830c959579b
Signed-off-by: Vijay Viswanath <vviswana@codeaurora.org>