Create mbed_lib.json for mbedtls target code

connectivity/drivers/mbedtls/TARGET_Cypress/mbed_lib.json

@@ -0,0 +1,3 @@
+{
+    "name": "mbedtls-cypress"
+}

connectivity/drivers/mbedtls/TARGET_NUVOTON/mbed_lib.json

@@ -0,0 +1,3 @@
+{
+    "name": "mbedtls-nuvoton"
+}

connectivity/drivers/mbedtls/TARGET_STM/mbed_lib.json

@@ -0,0 +1,3 @@
+{
+    "name": "mbedtls-stm"
+}

connectivity/drivers/mbedtls/TARGET_Samsung/mbed_lib.json

@@ -0,0 +1,3 @@
+{
+    "name": "mbedtls-samsung"
+}

connectivity/drivers/mbedtls/TARGET_Silicon_Labs/mbed_lib.json

@@ -0,0 +1,3 @@
+{
+    "name": "mbedtls-siliconlabs"
+}