bluetooth: coex: increase BT_LONG_WQ stack to fix coex app hang

Currently, coex application is enable the mbedtls and PAS feature,
this causes BT_LONG_WQ thread to use more stack size.

Signed-off-by: Author You <author.you@nxp.com>

Author: yyounxp

soc/nxp/rw/Kconfig.defconfig

@@ -29,6 +29,7 @@ config MAIN_STACK_SIZE
 	default 2560
 
 config BT_LONG_WQ_STACK_SIZE
+	default 5120 if (WIFI || IEEE802154)
 	default 2560
 
 config SYSTEM_WORKQUEUE_STACK_SIZE