iwlwifi: mvm: check TLV flag before trying to use hotspot firmware commands

iwlwifi: mvm: check TLV flag before trying to use hotspot firmware commands

commit 5ac6c72e594471acfa5b00210c51d533a73413ad upstream.

Older firmwares do not provide support for the HOT_SPOT_CMD command.
Check for the appropriate TLV flag that declares hotspot support in
the firmware to prevent a firmware assertion failure that can be
triggered from the userspace,

Signed-off-by: Luciano Coelho <luciano.coelho@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>