wil6210: debugfs interface to send raw WMI command

Debug aid

Change-Id: I0d3e2021396fe4403ab63fe31ac3d583e58be095
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Git-commit: ff974e4083341383d3dd4079e52ed30f57f376f0
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-testing.git


Signed-off-by: Hamad Kadmany <hkadmany@codeaurora.org>