Fix error message on wrong compiles of 2065x

Current error message refers to sandybridge chipset. Instead error
should be that 2065x needs Ibex Peak.

Change-Id: I8cc8a34f496aec7af0ce95b4b65fd25e165f43fb
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4202
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/cpu/intel/model_2065x/bootblock.c

@@ -30,7 +30,7 @@
 #include <southbridge/intel/ibexpeak/pch.h>
 #include "model_2065x.h"
 #else
-#error "CPU must be paired with Intel BD82X6X or C216 southbridge"
+#error "CPU must be paired with Intel Ibex Peak southbridge"
 #endif
 
 static void set_var_mtrr(