Merge changes Ic6c1c8e4,Ie0d8e103,Id106b382,Icf3ca4e2,I74db4587 into wlan-cld3.driver.lnx.2.0

* changes:
  Release 5.2.0.138N
  qcacld-3.0: Add null check for qdf_ctx in hdd_configure_cds
  qcacld-3.0: Add support to configure avoid acs freq list
  qcacld-3.0: Remove redundant init and check in policy_mgr_skip_dfs_ch
  qcacld-3.0: Advertise max BA buffer size in HE mode