Update how flag read only status is passed to aapt2

Now in addition to name:ro we also support name:READ_ONLY and
name:READ_WRITE

Test: Automatic
Bug: atest 344979955
Flag: EXEMPT Aconfig not supported on host tools
Change-Id: I0b581ac250f36b209d5151d0caa0a5c3c2d311cc
diff --git a/tools/aapt2/cmd/Util.cpp b/tools/aapt2/cmd/Util.cpp
index e839fc1..7739171 100644
--- a/tools/aapt2/cmd/Util.cpp
+++ b/tools/aapt2/cmd/Util.cpp
@@ -137,22 +137,25 @@
       diag->Error(android::DiagMessage() << "No name given for one or more flags in: " << arg);
       return false;
     }
+
     std::vector<std::string> name_parts = util::Split(flag_name, ':');
     if (name_parts.size() > 2) {
       diag->Error(android::DiagMessage()
                   << "Invalid feature flag and optional value '" << flag_and_value
-                  << "'. Must be in the format 'flag_name[:ro][=true|false]");
+                  << "'. Must be in the format 'flag_name[:READ_ONLY|READ_WRITE][=true|false]");
       return false;
     }
     flag_name = name_parts[0];
     bool read_only = false;
     if (name_parts.size() == 2) {
-      if (name_parts[1] == "ro") {
+      if (name_parts[1] == "ro" || name_parts[1] == "READ_ONLY") {
         read_only = true;
+      } else if (name_parts[1] == "READ_WRITE") {
+        read_only = false;
       } else {
         diag->Error(android::DiagMessage()
                     << "Invalid feature flag and optional value '" << flag_and_value
-                    << "'. Must be in the format 'flag_name[:ro][=true|false]");
+                    << "'. Must be in the format 'flag_name[:READ_ONLY|READ_WRITE][=true|false]");
         return false;
       }
     }