qcacmn: Change Shadow Register configuration for QCA6390

- Change the SR mapping address for QCA6390
- Use ring direction field from HAL ring config instead of HAL ring
  directly as ring is not yet initialized here.

Change-Id: I900b2329367cc02ae2f9d7f164e5f867d8253d90
CRs-Fixed: 2299919
2 files changed