qcacld-3.0: Clean up cfg80211 del_station for Kernel upgrade

Commit: 89c771e ("cfg80211: Convert del_station() callback to
use a param struct")
Commit: 9885686 ("cfg80211: Specify frame and reason code for
NL80211_CMD_DEL_STATION")

These two commits have been merged in Kernel 3.19.

Add a kernel version macro to support this.
And refactor the inclusion of CFG80211_DEL_STA_V2 by adding a
helper function to clean it up, that way we can keep the flag
only in wlan_hdd_cfg80211.h/c as this is the cfg80211 interface
related changes.

Change-Id: I811065b7fa1cf2aee68cfe63c5cf78c2270e5af7
CRs-fixed: 963651
4 files changed
tree: 10c4e7a003c8743972db611661cd1995e13fce6b
  1. config/
  2. core/
  3. target/
  4. uapi/
  5. Android.mk
  6. Kbuild
  7. Kconfig
  8. Makefile
  9. README.txt