cmake: Allow -Os on RISC-V again

The previously detected regressions when building with -Os on RISC-V
have been resolved.

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard

cmake/zephyr/Kconfig

@@ -27,5 +27,4 @@ config PICOLIBC_DEFAULT
 # gcc 14.3 has bugs compiling with -Os on riscv
 choice COMPILER_OPTIMIZATIONS
 	default SPEED_OPTIMIZATIONS if ("$(TOOLCHAIN_VARIANT_COMPILER)" = "gnu") && CPP_EXCEPTIONS
-	default SPEED_OPTIMIZATIONS if ("$(TOOLCHAIN_VARIANT_COMPILER)" = "gnu") && RISCV
 endchoice