qcacld-3.0: Refactor LATENCY_LEVEL configuration

One of the HDD functions with the highest cyclomatic complexity is
__wlan_hdd_cfg80211_wifi_configuration_set(). In order to reduce the
complexity there is a plan to replace the inline attribute handling
with a vtable-based approach.

As part of that goal refactor the following independent attribute
handling into a separate function and add that function to the vtable:
- QCA_WLAN_VENDOR_ATTR_CONFIG_LATENCY_LEVEL

Change-Id: I84ea1d02a91a08ac3c2bd8d020ecdc05176d1668
CRs-Fixed: 2371584
1 file changed