scsi: ufs: Add new debugfs entry to crash on ufs error

This change adds new debugfs entry to support crashing
system on UFS error. By default, it will be set to N.
To enable selective crash on ufs error:
echo Y > /sys/kernel/debug/<ufshc node>/crash_on_err

Change-Id: Ie52ef5f4fd5c9028c39b01d3fad6142a362ebabf
Signed-off-by: Sayali Lokhande <sayalil@codeaurora.org>