tests: cmsis_rtos_v1: Wait for longer duration in k_busy_wait

For boards like nrf52 with low system clock (32768), k_busy_wait
for values less than 1 second (1000000 us) ends up waiting less
than the desired wait time because of decimal truncation while
converting wait time to hw clock cycles. Hence increased the wait
to 1 second.

Signed-off-by: Spoorthi K <spoorthi.k@intel.com>