wil6210: include moduleparam.h

This now declares a module parameter, so include the necessary
header file for that.

Change-Id: I430c996ef2d35d0af86ab0822baccdf477db229e
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Git-commit: 949c2d0096753d518ef6e0bd8418c8086747196b
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git


Signed-off-by: Maya Erez <merez@codeaurora.org>