shell: update shell_uart backend test condition
shell: update shell_uart backend test condition

New shell does not need either CONFIG_UART_CONSOLE
or interrupts support to be working. Only CONFIG_SERIAL
in combination with CONFIG_UART_SHELL_ON_DEV_NAME are required.
Updated sample yaml file accordingly.

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

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