Documentation/process: maintainer-soc: document dtbs_check requirement for Samsung

Samsung ARM/ARM64 SoCs (except legacy S5PV210) are also expected not to
bring any new dtbs_check warnings.  In fact this have been already
enforced and tested since few release.

Cc: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230712084131.127982-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Arnd Bergmann <arnd@arndb.de>

Documentation/process/maintainer-soc.rst

@@ -133,8 +133,8 @@ with the dt-bindings that describe the ABI.  Please read the section
 more information on the validation of devicetrees.
 
 For new platforms, or additions to existing ones, ``make dtbs_check`` should not
-add any new warnings.  For RISC-V, as it has the advantage of being a newer
-architecture, ``make dtbs_check W=1`` is required to not add any new warnings.
+add any new warnings.  For RISC-V and Samsung SoC, ``make dtbs_check W=1`` is
+required to not add any new warnings.
 If in any doubt about a devicetree change, reach out to the devicetree
 maintainers.