qcacld-3.0: Remove sme_disable_feature_capablity()
Change I0ded9473083418f6bb33cec4fa43a17c8c281177 ("qcacld-3.0: Remove
hdd_exchange_version_and_caps()") removed the only client of
sme_disable_feature_capablity(). Since this function is an obsolete
stub, remove it.
Change-Id: I8cf83e7f370a644c6e814aa7b4aedad1f7fec88f
CRs-Fixed: 2371145