samples: matter: light_bulb: Fix AWS IoT configuration

Enable SHA384 to fix connection towards AWS IoT.
SHA384 isn't required by AWS IoT, but due to some configuration issues
in MBEDTLS, its needed.

Signed-off-by: Simen S. Røstad <[email protected]>
(cherry picked from commit 348d00e)

Author: simensrostad

samples/matter/light_bulb/overlay-aws-iot-integration.conf

@@ -30,6 +30,7 @@ CONFIG_MQTT_CLEAN_SESSION=y
 # MBed TLS
 CONFIG_MBEDTLS_HEAP_SIZE=98304
 CONFIG_MBEDTLS_RSA_C=y
+CONFIG_MBEDTLS_SHA384_C=y
 CONFIG_MBEDTLS_SSL_OUT_CONTENT_LEN=1024
 
 # PSA