mmc: sdhci-msm-ice: implement 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: I6817de46d895b61f410dd732be57ba60efb58fb2
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>