qcacmn: Add support for QCA6490

Add the following support for QCA6490:
1. Initialize the qca6490_hal_hw_txrx_ops
2. Initialize the hw_srng_table
3. Attach hal_qca6490_attach

Change-Id: Ic53c520ef804eb4fbe1434c704e9040c83011d3d
CRs-Fixed: 2522133
11 files changed