N PHY Clip Detection (u8 write, u16 *vals)

1. If write is zero
   1. Set vals[0] to PHY Register 0x2C
   2. Set vals[1] to PHY Register 0x42
2. Otherwise
   1. Set PHY Register 0x2C to vals[0]
   2. Set PHY Register 0x42 to vals[1]