ARM: dts: msm: add support for jtagv8 driver on sdm670

jtagv8 driver can be used to save and restore debug and ETM
registers across power collapse.Added devices nodes to
support save/restore etm registers for sdm670.

Change-Id: I5ddc5dc2136a2d27a38eb69afa91ca28d900f26f
Signed-off-by: Saranya Chidura <schidura@codeaurora.org>