Fix driver schema json default type requirements

Signed-off-by: Gergely Korcsák <gergely.korcsak@arm.com>

ChangeLog.d/fix-driver-schema-check.txt

@@ -0,0 +1,3 @@
+Bugfix
+   * Fix invalid JSON schemas for driver descriptions used by
+     generate_driver_wrappers.py.

scripts/data_files/driver_jsons/driver_opaque_schema.json

@@ -11,7 +11,7 @@
     },
     "type": {
       "type": "string",
-      "const": ["opaque"]
+      "const": "opaque"
     },
     "location": {
       "type": ["integer","string"],

scripts/data_files/driver_jsons/driver_transparent_schema.json

@@ -11,7 +11,7 @@
     },
     "type": {
       "type": "string",
-      "const": ["transparent"]
+      "const": "transparent"
     },
     "mbedtls/h_condition": {
       "type": "string"