msrtool: Fix Intel CPUs detection

Added vendor check in sys.c file and fixed models checking
in intel targets files.

Change-Id: I1ce52bbce431dea79e903d6bc7a12e5b9ad061be
Signed-off-by: Anton Kochkov <anton.kochkov@gmail.com>
Reviewed-on: http://review.coreboot.org/1169
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

util/msrtool/intel_core2_early.c

@@ -21,7 +21,7 @@
 
 int intel_core2_early_probe(const struct targetdef *target) {
 	struct cpuid_t *id = cpuid();
-	return ((0x6 == id->family)&(0xf == id->model));
+	return ((0x6 == id->family) && (0xf == id->model));
 }
 
 const struct msrdef intel_core2_early_msrs[] = {