CODEOWNERS: Add @avisconti as maintainer
CODEOWNERS: Add @avisconti as maintainer

Add @avisconti as maintainer for following stuff:

- ArgonKey board
- STM32 I2S driver
- ST motion sensor drivers

Signed-off-by: Armando Visconti <d93ca24ded08d03c3aa60af6d2fd0eb7ce54da11@st.com>

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