PHY BMAC Write Shared Memory (u32 offset, u16 value)

1. Write (0x00010000 | (offset >> 2) to MIMO memory location 0x160

2. Read MIMO memory location 0x160

3. If offset & 2

   1. Write value to MIMO memory location 0x165 (Should this not be 0x166?)
4. Otherwise
   1. Write value to MIMO memory location 0x164