statsd: Add BatteryCycleCount atom

The health HAL specifies a charge cycles path that currently has no
atoms allocated to it. This change will allow statsd to collect this
information. I also ran 'clang-format -i --style=file' on this file.

Bug: 120680509
Test: cts-tradefed run singleCommand cts-dev -m CtsStatsdHostTestCases \
      -t android.cts.statsd.atom.HostAtomTests#testBatteryCycleCount
Test: adb shell cmd stats pull-source 10045
Change-Id: I796b275c5d6880e9d7ec5bc468b55d7dc421ac78
Signed-off-by: Maggie White <maggiewhite@google.com>