qcacld-2.0: Pair spin lock with unlock

In some failure path of tlshim_mgmt_rx_process function,
locked spin lock must unlock before exit.
Optimize opClasses check in csrInitOperatingClasses.

Change-Id: I9fc195fac16e3b8ec03e0c87a48658d7748d1c31
CRs-Fixed: 2155647