s/hidl_/hal_/ for hidl_implementation_test

In preparation for it including AIDL things.

Bug: 145920591
Test: TH
Change-Id: Ibb5022f049d3c71668e8bde5ff5910ff1d466a95
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 0e18f48..543acf6 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -7,7 +7,7 @@
       "name": "vts_treble_vintf_vendor_test"
     },
     {
-      "name": "hidl_implementation_test"
+      "name": "hal_implementation_test"
     }
   ]
 }