Revert "mainboard/lenovo/x230: Add ThinkPad x230s as a variant"

This reverts commit 6b95507ec5, in order
to recommit and review it again.

Change-Id: Id4ddf99200f77016a48d02a8421d080cea492aae
Signed-off-by: Bill XIE <persmule@hardenedlinux.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41504
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

Documentation/mainboard/index.md

@@ -102,7 +102,6 @@ The boards in this section are not real mainboards, but emulators.
 - [W530](lenovo/w530.md)
 - [T430 / T530 / X230 / W530 common](lenovo/Ivy_Bridge_series.md)
 - [T431s](lenovo/t431s.md)
-- [X230s](lenovo/x230s.md)
 - [Internal flashing](lenovo/ivb_internal_flashing.md)
 
 ### Haswell series

Documentation/mainboard/lenovo/Ivy_Bridge_series.md

@@ -1,6 +1,6 @@
 # Lenovo Ivy Bridge series
 
-This information is valid for all supported models, except T430s, [T431s](t431s.md) and [X230s](x230s.md).
+This information is valid for all supported models, except T430s and T431s.
 
 ## Flashing coreboot
 ```eval_rst

Documentation/mainboard/lenovo/x230s.md

@@ -1,15 +0,0 @@
-# Lenovo X230s
-
-## Disassembly Instructions
-
-You must remove the following parts to access the SPI flash chip:
-
-![x230s_bc_removed](x230s_bc_removed.jpg)
-
-* Base cover
-
-Its [Hardware Maintenance Manual](https://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/x230s_hmm_en_0c10860_01.pdf) could be used as a guidance of disassembly.
-
-The SPI flash chip (W25Q128.V in thr form of SOIC-8 for mine) is located at the circled place. Unlike [most Ivy Bridge ThinkPads](Ivy_Bridge_series.md), X230s has a single 16MiB SPI flash chip.
-
-The general [flashing tutorial](../../flash_tutorial/index.md) has more details.