Kconfig: revert -Os default for RISC-V on GCC 14.3#94666

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masz-nordic wants to merge 1 commit intozephyrproject-rtos:collab-sdk-devfrom

masz-nordic:collab-sdk-dev

Commits on Sep 25, 2025

Revert "Use SPEED_OPTIMIZATIONS on riscv for GCC 14.3"
masz-nordic
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