target/arm: Implement VLDR/VSTR system register

Implement the new-in-v8.1M VLDR/VSTR variants which directly
read or write FP system registers to memory.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20201119215617.29887-10-peter.maydell@linaro.org
2 files changed