edge_control: TLS enable SHA1

Author: pennam

variants/EDGE_CONTROL/conf/mbed_app.json

@@ -4,6 +4,7 @@
 		"MBED_STACK_STATS_ENABLED=1",
 		"MBED_MEM_TRACING_ENABLED=1",
 		"NRFX_GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS=8",
+		"MBEDTLS_SHA1_C=1",
 		"NRFX_WDT_ENABLED=1"
 	],
 	"target_overrides": {