mmc: cmdq: add new crypto_cfg_reset host operation

When encryption/decryption is enabled in CQ mode, the
legacy commands that are sent in HALT state will use
different slot other than slot 0 for crypto configuration
information. The slot that is selected depends on the last
slot that was used when it is in CQ mode.  This is causing
the data of legacy commands to be encrypted/decrypted based
on the wrong slot usage for crypto config details. Hence,
clear the crypto configuration of the slot used in CQ mode
whenever it gets completed.

Change-Id: If573de5025054a10de1dde544aa79022016f65fd
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>