mmc: block: Add error handling to command queue host

On error, the CMDQ engine stops processing requests. It is then
halted and error handled.
The error have been categorized as below:
1. Command error
	a. time-out
		- invalidate all pending tags & requeue
		- reset both card & controller
	b. crc
		- end the error mrq
		- tune
		- unhalt
2. Data error
	a. time-out
		- invalidate all pending tags & requeue
		- reset both card and controller
	b. crc
		- end the error mrq
		- tune
		- unhalt
3. RED error
	This is device specific error and is not recoverable.
	The card and controller are reset in this case and all
	pending tags are invalidated and requeued.

Change-Id: I791d05f6b31d8f9b35a56fe85007b320c14e8b46
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>