soc: silabs: siwx91x: enable BLE stack bypass for host-driven operation

Set SL_SI91X_BT_BLE_STACK_BYPASS_ENABLE in ble_ext_feature_bit_map to support
host-driven BT/BLE stack operation on SiWx91x devices.

When enabled:
- Events are delivered directly to the host, bypassing internal stack processing
- Ensures critical events like CARD_READY reach the host reliably
- Allows external host stack to control BT/BLE operations
- Provides more memory to the application, as the internal stack is bypassed

This change enables direct event packet delivery from the firmware event handler,
ensuring proper operation when the internal BT stack is bypassed.

Required for BT/BLE tester and host-controlled stack configurations.

Signed-off-by: Arun kumar Nagelly <[email protected]>

Author: Arunnagelly

soc/silabs/silabs_siwx91x/siwg917/nwp.c

@@ -189,7 +189,8 @@ static void siwx91x_configure_sta_mode(sl_si91x_boot_configuration_t *boot_confi
 			SL_SI91X_BLE_NUM_CONN_EVENTS(RSI_BLE_NUM_CONN_EVENTS) |
 			SL_SI91X_BLE_NUM_REC_BYTES(RSI_BLE_NUM_REC_BYTES) |
 			SL_SI91X_BLE_ENABLE_ADV_EXTN |
-			SL_SI91X_BLE_AE_MAX_ADV_SETS(RSI_BLE_AE_MAX_ADV_SETS);
+			SL_SI91X_BLE_AE_MAX_ADV_SETS(RSI_BLE_AE_MAX_ADV_SETS) |
+			SL_SI91X_BT_BLE_STACK_BYPASS_ENABLE;
 #endif
 }