This commit deals mainly with bsim tests which have `common.c/h` files.
It does the following changes:
* Use functionality from the `babbelkit` library for common functions
related to flags, test progression (failing, passing etc.) and
synchronization between two devices. Locally defined equivalents are
removed.
* Remove the `common.c/h` containing only functionality that is provided
by the `babblekit` library.
* Remove the `test_pre_init_f` and `test_tick_f` functions (commonly
implemented as `test_init` and `test_tick`) from the modified tests.
These functions are not needed as they were only used to fail the test
if a device didn't complete the test within a certain time frame. This
is already handled by the `sim_length` argument used in the test
scripts.
* Changes use of `atol` to `strtol` as the prior is against Zephyr
coding guidelines.
Signed-off-by: Håvard Reierstad <haavard.reierstad@nordicsemi.no>
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