CODEOWNERS: update logging and shell code owners
CODEOWNERS: update logging and shell code owners

Logging system and shell did not have code owners. Since shell
and logger has been replaced by me and Krzysztof hence I've added
us as a code owners.

Signed-off-by: Jakub Rzeszutko <db01fea5b4491dba4fc272e7096cf665c7b907b9@nordicsemi.no>

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