ext4_utils: format files

Format *.cpp according to the new .clang-format. The following command
was used to generate this change:

  $ find . \( -name \*.cpp -o -name \*.h \) -exec clang-format \
    --style=file -i {} \;

Test: mm
Bug: 171699326
Change-Id: I2514746ad3fe3d0c14f7efcf3868997a3a31be6f
12 files changed