mmc: block: Error handling fixes and support of reset_all

This does following:

1. Adds support to handle multiple cmdq software requests timeout.
   Currently we schedule error handling work for the first timedout
   request. We requeue all pending tasks, knock off all tasks from
   device queue and reset card and controller as part of this, then
   for all other software requests timeout, if it comes while executing
   error work, we return BLK_EH_NOT_HANDLED.
   This fixes BUG_ON in case of multiple requests timesout together.

2. Current code resets CQE, power cycle the card and requeue all the
   requests in case of any error.

3. mmc_blk_cmdq_err work takes care freeing up all resource allocation
   like clk and rpm hold, in case of reset_all.

4. Currently we were never clearing error CMDQ_STATE_ERR in case of any
   error. This patch takes care of this bug.

Change-Id: I83d483c11fe2d7f2e462086cc3c0932057304c0d
Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
[subhashj@codeaurora.org: fixed compilation error]
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
[xiaonian@codeaurora.org: fixed merge conflicts]
Signed-off-by: Xiaonian Wang <xiaonian@codeaurora.org>