a39285b720
The shell subsystem currently uses k_poll for signalling. However,
k_poll is only used for simple event signals, results are not used.
Replacing the k_poll with k_event greatly simplifies the code, and
saves 4 struct k_poll_signal and 4 struct k_poll_event (one of which
was entirely unused) while costing a single struct k_event, for
every shell instance. It also allows us to not select POLL,
as we are using the simpler EVENTS instead.
A quick test build of the shell test suite on an nrf54l15 produces
the following build info:
using EVENTS:
FLASH: 71592 B 1428 KB 4.90%
RAM: 9872 B 188 KB 5.13%
IDT_LIST: 0 GB 32 KB 0.00%
using POLL
FLASH: 75524 B 1428 KB 5.16%
RAM: 11224 B 188 KB 5.83%
IDT_LIST: 0 GB 32 KB 0.00%
Signed-off-by: Bjarki Arge Andreasen <bjarki.andreasen@nordicsemi.no>
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