drivers: timer: remove fsl_power.h for MCXN series

Initial it was only removed for mcxn236 but mcnx947 would fail to
compile then

Signed-off-by: Peter van der Perk <peter.vanderperk@nxp.com>

drivers/timer/mcux_os_timer.c

@@ -16,7 +16,7 @@
 #include <zephyr/drivers/counter.h>
 #include <zephyr/pm/pm.h>
 #include "fsl_ostimer.h"
-#ifndef CONFIG_SOC_MCXN236
+#ifndef CONFIG_SOC_SERIES_MCXN
 #include "fsl_power.h"
 #endif