support csky target in ioctl/linux.rs (#890)

Author: Dirreke

src/ioctl/linux.rs

@@ -50,7 +50,8 @@ const DIR_MASK: RawOpcode = (1 << DIR_BITS) - 1;
     target_arch = "aarch64",
     target_arch = "riscv32",
     target_arch = "riscv64",
-    target_arch = "loongarch64"
+    target_arch = "loongarch64",
+    target_arch = "csky"
 ))]
 mod consts {
     use super::RawOpcode;