tests: condvar: fix one testcase failure on qemu_cortex_a53_smp
tests: condvar: fix one testcase failure on qemu_cortex_a53_smp

After enabled FPU context switch, one condvar testcase failed due to
the order of spawning thread cannot be guaranteed. Add a delay to
make sure the thread which initializing the condvar run first.

Signed-off-by: Enjia Mai <233e651694b7770d0f980a273a8e4a6f7e2a84d4@intel.com>

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