crc8: fix const correctness
crc8: fix const correctness

Declares the array with constant data const.

Tested with tests/unit/lib/crc.

Signed-off-by: Alexander Polleti <da2d2382bbdc78b448d07c8f504b16f0d29ec86a@yahoo.de>

explora26/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,ldts/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,explora26/zephyr,galak/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,explora26/zephyr,nashif/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,ldts/zephyr,punitvara/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,punitvara/zephyr,finikorg/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,nashif/zephyr,Vudentz/zephyr,galak/zephyr,Vudentz/zephyr,punitvara/zephyr,punitvara/zephyr,ldts/zephyr,Vudentz/zephyr