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1. Use const and pass by reference when appropriate.
2. Convert NULL to nullptr in the modified files.
3. Fix some file formatting to match clang.
4. Use default and explicit constructors where they should be
5. Remove unused SetCrtc overload.

BUG=987274
TEST=HardwareDisplayControllerTest, HardwareDisplayPlaneManager*Test

Change-Id: Ic0f019bfa862a5160805ecbfd22dc391e6f9f418
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031864
Commit-Queue: Mark Yacoub <markyacoub@google.com>
Auto-Submit: Mark Yacoub <markyacoub@google.com>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737024}