ARM: dts: msm: modify cpu nodes for sdm660

Modify cpu node information used by etm save
restore nodes. Etm save restore is used to
save etm data across power collapse.

CRs-fixed: 1056777
Change-Id: Ib00f5098412e0dbfd7aea81594129ddaa15664b9
Signed-off-by: Amey Telawane <ameyt@codeaurora.org>