soc: nxp: mcxw: Update IRQ Size for MCXW to remove reserved IRQ

The FRDM_MCXW71 Platform has a reserved IRQ as its
last IRQ, this test was using this IRQ to
test an interrupt and would not fire. This change
ensures the test does not use the reserved IRQ.

Signed-off-by: Emilio Benavente <emilio.benavente@nxp.com>

soc/nxp/mcx/mcxw/Kconfig.defconfig

@@ -4,7 +4,7 @@
 if SOC_SERIES_MCXW
 
 config NUM_IRQS
-	default 76
+	default 75
 
 config SYS_CLOCK_HW_CYCLES_PER_SEC
 	default 96000000 if CORTEX_M_SYSTICK