MAINTAINERS: Replace joerchan with alwa-nordic
MAINTAINERS: Replace joerchan with alwa-nordic

I'm taking over for joerchan at Nordic Semiconductor as a Zephyr
Bluetooth host collaborator.

Signed-off-by: Aleksander Wasaznik <c0d989573cb73e7c43339e7aaab9bc0cb8ebe8c5@nordicsemi.no>

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