Add display Power Mode information while layer dumps

Specify active display information while HWC layer dumps, depending on
the display Power Mode status.

Bug: 199037164
Test: dumpsys SurfaceFlinger
Change-Id: I09d6cb4462a6701ba8d3a841e6b5adf188c18b64
Signed-off-by: Siddharth Kapoor <ksiddharth@google.com>