Fix endianness for cortex_r4 and cortex_r5 when inserting software breakpoints. Because the cortex_a target is used by the cortex_r architecture and some chips start in BE by default (e.g. TMS570) Change-Id: I68b7fe7c4604de67fee2e64fff0fad2691659a58 Signed-off-by: Lucien Dufour <lucien.buchmann@dufour.aero> Reviewed-on: https://review.openocd.org/c/openocd/+/8909 Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com> Tested-by: jenkins