ARM: dts: msm: Add support for jtagv8 driver on SDM845

jtagv8 driver can be used to save and restore debug and ETM
registers across power collapse.

Change-Id: I28fcae04f665b04284f6270f27308ae1acc0f13e
Signed-off-by: Satyajit Desai <sadesai@codeaurora.org>