libc: arcmwdt: replace _write if not provided by the POSIX subsystem

If CONFIG_POSIX_API is enabled, but CONFIG_POSIX_DEVICE_IO_ALIAS_WRITE
is not, the _write replacement should be provided to make stdio work.

Signed-off-by: Ilya Tagunov <Ilya.Tagunov@synopsys.com>

lib/libc/arcmwdt/libc-hooks.c

@@ -62,7 +62,7 @@ static inline int z_vrfy_zephyr_write_stdout(const void *buf, int nbytes)
 #include <zephyr/syscalls/zephyr_write_stdout_mrsh.c>
 #endif
 
-#ifndef CONFIG_POSIX_API
+#ifndef CONFIG_POSIX_DEVICE_IO_ALIAS_WRITE
 int _write(int fd, const char *buf, unsigned int nbytes)
 {
 	ARG_UNUSED(fd);