tests: dma: fix loopback suspend and resume issue
tests: dma: fix loopback suspend and resume issue

update dma loop test to resolve call sequence issue,
and avoid randum failure due to
dma finished fast than the dma status check. which cause suspend fails.

fixing #43739

Signed-off-by: Hake Huang <141c0384c6b2febca367ae94dc4dc40a33a7ba79@oss.nxp.com>

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