The LoRaWAN subsystem does not require 2KiB of system workqueue,
testing on nrf54l15 flpr (RISCV) CPU (with custom cryptography code)
shows it uses about 700 bytes of the system workqueue, therefore it
is assumed that the real requirement for 2KiB is the software
cryptography features, not the LoRaWAN stack itself, and the
cryptography parts of LoRaWAN can be replaced with alternatives
that do not need this high of a memory requirement, so the
requirement has been moved to the specific Kconfig for software
cryptography instead
Signed-off-by: Jamie McCrae <spam@helper3000.net>
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