tests: scheduler_api removed MPS2 workaround
tests: scheduler_api removed MPS2 workaround

CONFIG_SOC_SERIES_MPS2 specific test workaround is removed
to use systick drives as tickless.

Signed-off-by: Andrei Gansari <f1330555a90b7a22d81843f3c4366f58b50eae34@nxp.com>

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