unwindstack: rename Memory::Read to ReadFully.

Rename Memory::Read to ReadFully to match its semantics with that of
android::base. ReadPartially will be renamed to Read in a follow up
commit, kept intentionally separate so that there aren't any callers
accidentally switched from ReadFully to Read.

Test: treehugger
Change-Id: I7d845ac5244c3025d92c8512e960e5d0d1da05af
diff --git a/libunwindstack/tests/UnwindTest.cpp b/libunwindstack/tests/UnwindTest.cpp
index 9f9ca8b..57aec97 100644
--- a/libunwindstack/tests/UnwindTest.cpp
+++ b/libunwindstack/tests/UnwindTest.cpp
@@ -174,7 +174,7 @@
       MemoryRemote memory(pid);
       // Read the remote value to see if we are ready.
       bool value;
-      if (memory.Read(addr, &value, sizeof(value)) && value) {
+      if (memory.ReadFully(addr, &value, sizeof(value)) && value) {
         *completed = true;
       }
       if (!*completed || !leave_attached) {