Update RTL8218B.md

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@ -2,6 +2,15 @@ RTL8214FC/RTL8218B (maybe generic RTL821x) Register Layout
This is a sum up of what we got from the comments in the GPL sources. Additionally some SerDes registers where identified that work similar like the RTL838x/RTL839x built in SerDes.
These basic registers are organized in pages of 32. Each page knows registers 0x00-0x1F
Page | Register | Bits | Feature | Documentation
--- | --- | --- | --- | ---
**Page** | **Register** | **Bits** | **unknown** |
0xa42 | 0x14 | 07:07 | 500M_EEE_ABILITY
These additional/internal registers are organized in pages of 8. Each page knows registers 0x10-0x17
Page | Register | Bits | Feature | Documentation
--- | --- | --- | --- | ---
**Page** | **Register** | **Bits** | **PTP feature** | **Absolute 0x1600**