ARM: dts: msm: Rename CTI nodes to lower case on sdm845 and sdm670

Rename CTI nodes in device tree of SDM845 and SDM670 to lower case
to help with consistent tool usage.

Change-Id: I73c8e23370b4e123b4cb1ec62b7045c00fa00ed1
Signed-off-by: Pratik Patel <pratikp@codeaurora.org>
Signed-off-by: Saranya Chidura <schidura@codeaurora.org>