samples: net: wifi: nxp: fix PEAP-TLS connection failure

The connection using EAP-PEAP-TLS with Cisco AP is failed for IW610, and
the console log shows 'Memory allocation failed (-0x3f80)'.
Increase the MBEDTLS_HEAP_SIZE for 10K can fix this issue.

Signed-off-by: Maochen Wang <[email protected]>

Author: MaochenWang1

samples/net/wifi/shell/nxp/overlay_hostap_hosted_mcu.conf

@@ -26,7 +26,7 @@ CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=8192
 
 # mbedtls heap for enterprise case
 CONFIG_MBEDTLS_ENABLE_HEAP=y
-CONFIG_MBEDTLS_HEAP_SIZE=80192
+CONFIG_MBEDTLS_HEAP_SIZE=90432
 
 #priority
 CONFIG_WIFI_NM_WPA_SUPPLICANT_WQ_PRIO=3