exec/memop: Remove unused memop_big_endian() helper

Last use of memop_big_endian() was removed in commit 592134617c9
("accel/tcg: Reorg system mode store helpers").

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20241003234211.53644-3-philmd@linaro.org>
1 file changed