Make MRC vs native a config rather than making a separate chipset for it.

Tested by making lenovo x230 configurable despite pretty MRC bugs.

Change-Id: Ia2a123f24334f5cd5f42473b7ce7f3d77c0e65b7
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: https://review.coreboot.org/13658
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/mainboard/lenovo/t420s/Kconfig b/src/mainboard/lenovo/t420s/Kconfig
index d1a3980..ce81af7 100644
--- a/src/mainboard/lenovo/t420s/Kconfig
+++ b/src/mainboard/lenovo/t420s/Kconfig
@@ -5,6 +5,7 @@
 	select SYSTEM_TYPE_LAPTOP
 	select CPU_INTEL_SOCKET_RPGA988B
 	select NORTHBRIDGE_INTEL_SANDYBRIDGE
+	select USE_NATIVE_RAMINIT
 	select SOUTHBRIDGE_INTEL_BD82X6X
 	select EC_LENOVO_PMH7
 	select EC_LENOVO_H8