doc: move CPU identification guidance into the device guide

Address review by documenting regget 4 and RTL8373 N/non-N ID values under Step 4 of adding-a-device.md, without referring to a particular board or set of units. Keep the verified Horaco CPU and flash capacity in its device table and retain the unverified-chip caveat.

doc/adding-a-device.md

@@ -177,3 +177,20 @@ Once the board has been tested on hardware:
    `doc/devices/KP-9000-6XH-X2.md` and document which `MACHINE` to pick for
    which silkscreen.
 
+### Identifying the CPU variant
+
+For RTL8373-based devices, use the read-only console command below to distinguish
+the N and non-N CPU variants:
+
+```text
+regget 4
+```
+
+| Register 0x0004 value | CPU |
+|---|---|
+| `0x83730000` | RTL8373 (non-N) |
+| `0x83737000` | RTL8373N |
+
+Record the identified CPU in the device documentation. These values identify
+only the CPU variant; document PHY and flash-chip models separately when verified.
+

doc/devices/SWTGW218AS.md

@@ -12,9 +12,7 @@ All boards in this table use `MACHINE=SWTGW218AS`. The Horaco HC-SWTGW218AS is a
 [SWTG018AS-A V2.0](SWTG018AS_A_V2_0.md) board, which needs a different firmware. Check the marking
 on the PCB before flashing.
 
-On all three tested Horaco HC-SWTGW218AS units with PCB SWTG118AS-V2.1, `regget 4` returned
-`REGGET: 0x0004: VAL: 0x83730000`, identifying the CPU as RTL8373 (non-N). An RTL8373N returns
-`0x83737000` instead. The PHY and flash-chip models on these units have not been verified.
+The PHY and flash-chip models for the tested Horaco units remain unverified.
 
 
 ## Photos