Add vcpkg build of protobuf and gRPC

Provision protobuf and gRPC packages using vcpkg.

Change-Id: I4d834236408938e228fb0721474edfad946a8dc8
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

coin/provisioning/common/linux/vcpkg/vcpkg.json

@@ -7,6 +7,8 @@
     }
   ],
   "dependencies": [
-    "openssl"
+    "openssl",
+    "protobuf",
+    "grpc"
   ]
 }

coin/provisioning/common/windows/vcpkg/vcpkg.json

@@ -7,6 +7,8 @@
     }
   ],
   "dependencies": [
-    "openssl"
+    "openssl",
+    "protobuf",
+    "grpc"
   ]
 }