wil6210: add option to load FTM FW

Module parameter allows to load specific FW used
for FTM testing.

Change-Id: I410de583e7813ac3430fade5e19b87a5cb911d28
Signed-off-by: Hamad Kadmany <qca_hkadmany@qca.qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Git-commit: 1c3964540425f1c12b652a2f2e45d73ffc16c37e
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git


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