can: flexcan: avoid unbalanced pm_runtime_enable warning

When do suspend/resume, meet the following warning message:
[   30.028336] flexcan 425b0000.can: Unbalanced pm_runtime_enable!

Balance the pm_runtime_force_suspend() and pm_runtime_force_resume().

Fixes: 8cb53b48

 ("can: flexcan: add auto stop mode for IMX93 to support wakeup")
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Link: https://lore.kernel.org/all/20221213094351.3023858-1-haibo.chen@nxp.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>