Fixed meminfo output format

- Removed the empty lines which occurs when running the dumpsys meminfo.
- Updated the output format of dumpsys meminfo which was collapsed
  with -S option.
- Print the private dirty in the same line instead of writing it in the
  next line.

Bug: 328410556
Test: verified adb shell dumpsys meminfo [options: -S/-p]
Change-Id: Icd33f005b560da60e957f027a87af5520b8df665