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>
8 files changed