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>

src/mainboard/google/link/Kconfig

@@ -4,7 +4,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	def_bool y
 	select SYSTEM_TYPE_LAPTOP
 	select CPU_INTEL_SOCKET_RPGA989
-	select NORTHBRIDGE_INTEL_IVYBRIDGE_MRC
+	select NORTHBRIDGE_INTEL_IVYBRIDGE
 	select SOUTHBRIDGE_INTEL_C216
 	select BOARD_ROMSIZE_KB_8192
 	select EC_GOOGLE_CHROMEEC
@@ -16,6 +16,10 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select SERIRQ_CONTINUOUS_MODE
 	select MAINBOARD_HAS_NATIVE_VGA_INIT
 
+config USE_NATIVE_RAMINIT
+	bool
+	default n
+
 config CHROMEOS
 	select CHROMEOS_VBNV_CMOS
 	select LID_SWITCH