ARM: dts: msm: Add debug and etm save-restore dt support for krypton

The ETM and Debug registers need to be saved and restored on msmkrypton
using memory mapped access and OS lock mechanism as cp14 access is not
permitted for these registers. Add device tree entry to support this
feature.

Change-Id: I8087a0b1b6bdd3d9ce77afe21a1e49a0aae80bdb
Signed-off-by: Aparna Das <adas@codeaurora.org>