ARM: dts: msm: Add jtagv8 support for MSM8937

jtagv8 driver can be used to save and restore debug and ETM
registers across power collapse. Add jtag nodes to support
save/restore ETM registers for MSM8937.

CRs-Fixed: 2230899
Change-Id: Iad3400fee87a13d7c88c7242e0781c92f289b900
Signed-off-by: Mao Jinlong <jinlmao@codeaurora.org>