target/riscv: Use FIELD_EX32() to extract wd field

Signed-off-by: Frank Chang <frank.chang@sifive.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20211210075704.23951-3-frank.chang@sifive.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/vector_helper.c

@@ -98,7 +98,7 @@ static inline uint32_t vext_lmul(uint32_t desc)
 
 static uint32_t vext_wd(uint32_t desc)
 {
-    return (simd_data(desc) >> 11) & 0x1;
+    return FIELD_EX32(simd_data(desc), VDATA, WD);
 }
 
 /*