tests/drivers/uart/uart_basic_api : Added build only tag
tests/drivers/uart/uart_basic_api : Added build only tag

Testcase yaml requires some interactive inputs to be provided for
execution and hence fails on automation. Hence making it as build
only

Signed-off-by: ravishankar karkala Mallikarjunayya <f7cc7b4215731292ef7f1a4934c293c198a3c40a@intel.com>

Vudentz/zephyr,zephyriot/zephyr,finikorg/zephyr,zephyriot/zephyr,aceofall/zephyr-iotos,mbolivar/zephyr,kraj/zephyr,punitvara/zephyr,finikorg/zephyr,nashif/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,finikorg/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,mbolivar/zephyr,nashif/zephyr,explora26/zephyr,ldts/zephyr,aceofall/zephyr-iotos,zephyrproject-rtos/zephyr,zephyriot/zephyr,kraj/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,kraj/zephyr,galak/zephyr,explora26/zephyr,kraj/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,explora26/zephyr,Vudentz/zephyr,explora26/zephyr,mbolivar/zephyr,zephyriot/zephyr,galak/zephyr,ldts/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,finikorg/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,aceofall/zephyr-iotos,mbolivar/zephyr,galak/zephyr,aceofall/zephyr-iotos,Vudentz/zephyr,kraj/zephyr,punitvara/zephyr,punitvara/zephyr,zephyriot/zephyr,mbolivar/zephyr,punitvara/zephyr,Vudentz/zephyr,galak/zephyr,explora26/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,aceofall/zephyr-iotos,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,finikorg/zephyr