Rename QCA_NL80211_VENDOR_SUBCMD_CONCURRENT_MULTI_STA_POLICY

Rename QCA_NL80211_VENDOR_SUBCMD_CONCURRENT_MULTI_STA_POLICY

Rename QCA_NL80211_VENDOR_SUBCMD_CONCURRENT_MULTI_STA_POLICY to
QCA_NL80211_VENDOR_SUBCMD_CONCURRENT_POLICY to allow extension for other
interface type(s). A subsequent commit will extend the renamed
definitions in a manner that is inconsistent with the current naming.

This is a precursor for AP/P2P concurrency policy configuration support
via updated vendor command QCA_NL80211_VENDOR_SUBCMD_CONCURRENT_POLICY.

Signed-off-by: Purushottam Kushwaha <quic_pkushwah@quicinc.com>