wl12xx: fix SG BT load value to reflect its new meaning

The Soft Gemini BT load ratio value has changed its meaning with FW
version 6.1.0.0.310.  It now means the passive scan compensation
percentage during A2DP EDR.  Instead of 50, we need to use 200.

Fix the SG configuration accordingly.

Signed-off-by: Luciano Coelho <coelho@ti.com>