soc: silabs: siwx91x: increase main stack size when nwp is active

Update the default MAIN_STACK_SIZE to 2048 bytes to accommodate
the initialization requirements of the network coprocessor (nwp),
particularly when power management is enabled. It resolves a bug
where we can't boot when PM is enabled with multiple active
peripherals.

Signed-off-by: Martin Hoff <[email protected]>

Author: Martinhoff-maker

soc/silabs/silabs_siwx91x/Kconfig.defconfig

@@ -20,6 +20,11 @@ if SILABS_SIWX91X_NWP
 config SYS_CLOCK_TICKS_PER_SEC
 	default 1024
 
+# Wiseconnect needs more than 1024 bytes of main stack size to initialize
+# (especially with PM)
+configdefault MAIN_STACK_SIZE
+	default 2048
+
 config NUM_PREEMPT_PRIORITIES
 	default 56