jtagv8: add jtagv8 snapshot

This snapshot is taken as of msm-4.4
'commit a6ff4b8ab4ad ("ARM: dts: qcom:
Remove lpm performance index for sdm660")'

It adds two head file for jtagv8 arm support.

Change-Id: I6a049dee89478b9a4ac0019dc15c857e2046541f
Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>