arch: arm64: cosmetic changes to register dump
arch: arm64: cosmetic changes to register dump

- Display full 64-bits register width in crash dumps
- Some values were prefixed 0x, some not.  Made consistent.

Signed-off-by: Luke Starrett <9951d33b0264d275e61550ec43d34128fa7b58fb@gmail.com>

galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,nashif/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,nashif/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,Vudentz/zephyr,nashif/zephyr,Vudentz/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,nashif/zephyr,Vudentz/zephyr,nashif/zephyr