qcacld-3.0: Add ini for BT/WLAN chain assignment

We need to set chainmask for BT /wlan share antenna
case, e.g:
2.4g:wlan 1x1 on chain 1, BT chain 0
5G: wlan 2x2 chain 1&0.

Add ini enableBTChainSeparation, default 0.
If enableBTChainSeparation set 1, chainmask will
be set to FW event though 2x2 case.

Change-Id: Ifc8c2c64824c793b72a7caa878f500c71f722e17
CRs-Fixed: 2206935
3 files changed