Add some missing includes.

Change-Id: I1e4658b6a9d57e407d04c71065d51ad8caf1d5cb
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/52732
Reviewed-by: Adam Langley <agl@google.com>
Reviewed-by: Bob Beck <bbe@google.com>

crypto/fipsmodule/ec/ec_key.c

@@ -79,6 +79,7 @@
 
 #include "internal.h"
 #include "../delocate.h"
+#include "../service_indicator/internal.h"
 #include "../../internal.h"
 
 

crypto/fipsmodule/ecdsa/ecdsa.c

@@ -64,6 +64,7 @@
 #include "../../internal.h"
 #include "../bn/internal.h"
 #include "../ec/internal.h"
+#include "../service_indicator/internal.h"
 #include "internal.h"
 
 

crypto/fipsmodule/service_indicator/service_indicator.c

@@ -15,6 +15,7 @@
 #include <openssl/crypto.h>
 #include <openssl/ec.h>
 #include <openssl/ec_key.h>
+#include <openssl/err.h>
 #include <openssl/evp.h>
 #include <openssl/service_indicator.h>