cleanup:Rename IBenchmarkService#readFile to measureReadRate

This CL renames IBenchmarkService#readFile to measureReadRate to make
the code more clear when introducing new read method later for authfs.

Test: atest MicrodroidBenchmarks
Change-Id: I1e39063ec704fcefb96f7d307e6598d291443645
diff --git a/tests/benchmark/Android.bp b/tests/benchmark/Android.bp
index bf78202..f1aebd2 100644
--- a/tests/benchmark/Android.bp
+++ b/tests/benchmark/Android.bp
@@ -29,7 +29,7 @@
 cc_library_shared {
     name: "MicrodroidBenchmarkNativeLib",
     srcs: ["src/native/benchmarkbinary.cpp"],
-    static_libs: ["libiovsock_vm"],
+    static_libs: ["libiobenchmark"],
     shared_libs: [
         "android.system.virtualmachineservice-ndk",
         "com.android.microdroid.testservice-ndk",
@@ -41,7 +41,7 @@
 }
 
 cc_library {
-    name: "libiovsock_vm",
+    name: "libiobenchmark",
     srcs: ["src/native/io_vsock.cpp"],
     export_include_dirs: ["src/native/include"],
     shared_libs: [