qcacld-3.0: Disable VHT in 2.4ghz HE mode if vendor vht INI is 0

Ini "gEnableVhtFor24GHzBand" is 0 to disable vendor VHT in HE
mode.

Fix is to disable VHT mode if HE mode in 2.4Ghz if
gEnableVhtFor24GHzBand is set to 0.

Change-Id: Ia4ae31440b5c018e58f9a03eb1e1c85832330431
CRs-Fixed: 2676984
7 files changed