counter: Refactor main Kconfig file

This patch refactors the main Kconfig file in order to align it with the
Zephyr code style and to make sure that each Kconfig configuration
portion is easily identifiable.

Change-Id: Iba83be8ae154df4b29ff423b4c3cc97a78c93e00
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@linaro.org>
2 files changed