target/mips: Factor mo_endian_rev() out of MXU code

Instead of swapping the reversed target endianness
using MO_BSWAP, directly return the correct endianness.

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20241010215015.44326-7-philmd@linaro.org>
2 files changed