wil6210: support new WMI-only FW capability

WMI_ONLY FW is used for testing in production. It cannot be used for
scan/connect, etc.
In case FW reports this capability, driver will not allow interface up.

Change-Id: Ifad411ba3fff136107ee73691008de3d013853b5
Signed-off-by: Dedy Lansky <qca_dlansky@qca.qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Git-commit: 0d2370e939acca97b5e1abc1aedd47c5c9a5f500
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git


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