wil6210: fix QCA_WLAN_VENDOR_ATTR_FREQ attribute ID

Fix QCA_WLAN_VENDOR_ATTR_FREQ attribute ID to match the official
value from the QCA vendor command definitions (qca-vendor.h).

Change-Id: I549752fe5c29de5346cf9263ccc16266cafbbecd
Signed-off-by: Lior David <liord@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Alexei Avshalom Lazar <ailizaro@codeaurora.org>