Add test for importing a single type.

Test: `cd system/tools/hidl && mma`

Bug: 31821285

Change-Id: I0be97b16b84f76b64c09f9dc52709416601cbbdf
diff --git a/tests/foo/1.0/IFoo.hal b/tests/foo/1.0/IFoo.hal
index c1c2c6b..3d82353 100644
--- a/tests/foo/1.0/IFoo.hal
+++ b/tests/foo/1.0/IFoo.hal
@@ -17,6 +17,8 @@
 package android.hardware.tests.foo@1.0;
 
 import IFooCallback;
+import IMyTypes.SomeStruct;
+import ITheirTypes.FloatArray;
 
 interface IFoo {
 
@@ -72,6 +74,11 @@
         ThreeStrings[5] s;
     };
 
+    struct MyStruct {
+        SomeStruct innerStruct;
+        FloatArray myFloatArray;
+    };
+
     doThis(float param);
     doThatAndReturnSomething(int64_t param) generates (int32_t result);
     doQuiteABit(int32_t a, int64_t b, float c, double d) generates (double something);