wil6210: remove fake support for RXHASH

Setting the same fake hash to all skbs prevents
distributing different flows to different CPU cores.

Change-Id: I0d2d0a2e937bc32061914bc61bd49c652b79b83b
Signed-off-by: Hamad Kadmany <hkadmany@codeaurora.org>
Signed-off-by: Lior David <liord@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Git-commit: a078c4cf0197c71a829ea927d1287e6b26a52c92
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git


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