Pull request #24: Increasing PBUF_POOL_SIZE from 16 to 32

Merge in WMN_TOOLS/matter from bugfix/wifi-pool-buffer-empty to RC_july_25_2022

Squashed commit of the following:

commit ea7a692120965623ee52c9805ffa2008b2af6b3d
Author: rosahay-silabs <Rohan.Sahay@silabs.com>
Date:   Thu Jul 21 00:59:43 2022 +0530

    Increasing PBUF_POOL_SIZE from 16 to 32

src/lwip/efr32/lwipopts-rs911x.h

@@ -124,7 +124,7 @@
 #define MEMP_SEPARATE_POOLS (1)
 #define LWIP_PBUF_FROM_CUSTOM_POOLS (0)
 #define MEMP_USE_CUSTOM_POOLS (0)
-#define PBUF_POOL_SIZE (16)
+#define PBUF_POOL_SIZE (32)
 #define PBUF_POOL_BUFSIZE (1280) // IPv6 path MTU
 #define PBUF_CUSTOM_POOL_IDX_START (MEMP_PBUF_POOL_SMALL)
 #define PBUF_CUSTOM_POOL_IDX_END (MEMP_PBUF_POOL_LARGE)