msr-tools: new package

The MSR Tools project provides utilities to access x86 processor MSRs
and CPU ID directly.

https://01.org/msr-tools



Signed-off-by: Vincent Stehlé <vincent.stehle@intel.com>
Cc: Yegor Yefremov <yegorslists@googlemail.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
[Thomas:
 - rewrap Config.in help text
 - use $(TARGET_MAKE_ENV) when calling $(MAKE).]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>