update riscv32 config to use newlib 3.1.0

Signed-off-by: Kumar Gala <[email protected]>

Author: galak

configs/riscv32.config

@@ -11,7 +11,6 @@ CT_ARCH_RISCV=y
 CT_ARCH_ARCH="rv32ima"
 CT_ARCH_ABI="ilp32"
 CT_TARGET_VENDOR="zephyr"
-CT_NEWLIB_V_2_5=y
 CT_LIBC_NEWLIB_TARGET_CFLAGS="-DMISSING_SYSCALL_NAMES"
 CT_LIBC_NEWLIB_IO_FLOAT=y
 # CT_LIBC_NEWLIB_FSEEK_OPTIMIZATION is not set