target/mips32: rework mips core register related functions
Update mips core definitions.
Reworked mips core register structure and read/write function.
Add coprocessor0 register definitions for target configuration.
Change-Id: I59c1f4cc4020db8a78e8d79f7421b87382fa1709
Signed-off-by: Walter Ji <walter.ji@oss.cipunited.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7864
Reviewed-by: Oleksij Rempel <linux@rempel-privat.de>
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>