[Telink] W91 stacks increase

Increased NET_MGMT_EVENT_STACK_SIZE by 122 B
and IPC_SERVICE_BACKEND_ICMSG_WQ_STACK_SIZE by 256 B
so that net_mgmt and icmsg_workq stack were used <90%.
Jenkins reported thread analyzer warnings on that.

config/telink/chip-module/Kconfig.defaults

@@ -83,8 +83,8 @@ config HEAP_MEM_POOL_SIZE
     default 1280
 
 config COMMON_LIBC_MALLOC_ARENA_SIZE
-    default 20716 if  SOC_SERIES_RISCV_TELINK_B9X_RETENTION
-    default 16384 if  SOC_RISCV_TELINK_TL321X
+    default 20716 if SOC_SERIES_RISCV_TELINK_B9X_RETENTION
+    default 16384 if SOC_RISCV_TELINK_TL321X
     default 12288
 
 config NET_IPV6_MLD
@@ -407,7 +407,10 @@ config CHIP_WIFI_CONNECTION_RECOVERY_JITTER
 	  within range [-JITTER; +JITTER].
 
 config NET_MGMT_EVENT_STACK_SIZE
-	default 1128
+	default 1250
+
+config IPC_SERVICE_BACKEND_ICMSG_WQ_STACK_SIZE
+	default 2304 if TELINK_W91_IPC_DISPATCHER
 
 endif # CHIP_WIFI