MMC: Core: Fix reading ext_csd and status from debugfs

When trying to read ext_csd and status of card from debugfs,
device is getting stuck. This is caused due to mishandling of
driver in type of request from block layer to command queue.

Driver in/out type of request handling added in command queue to
process request of type drv in/out.

Change-Id: I9a5a17dc262c43b4b4dfe3446c2887ffe3adc6f3
Signed-off-by: Ram Prakash Gupta <rampraka@codeaurora.org>