Revert "mwifiex: add /sys/kernel/debug/mwifiex/*/crash, to simulate crashes"

Marvell implemented this upstream, and we now have their implementation
after the 20160122 merge. Our patch used 'crash' interface in debugfs,
while theirs uses 'reset'. We don't need to carry our now duplicated patch
forward.

This reverts commit f0392302bda6bf4948877ab8147f41b30cd7e8b2.

Change-Id: I2d645050c0fe9944f77173f0056d7889f4f9159b
1 file changed