Set the 802.11 Core to an inactive state

1. Turn off the interrupts
2. Turn off the radio

3. MaskSet sbtmstatelow with mask 0xDFF5FFFF and set with 0xA0000

4. Delay 1 uSec

5. MaskSet sbtmstatelow with mask 0xFFF5FFFF and set with 0x80000

6. Delay 1 uSec
7. Switch active core to the other 802.11 Core
8. If this is a G PHY, set bit 0x20000000 in sbtmstatelow