target/arm: Update MSR access to UAO

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200208125816.14954-19-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
diff --git a/target/arm/internals.h b/target/arm/internals.h
index 4a13964..58c4d70 100644
--- a/target/arm/internals.h
+++ b/target/arm/internals.h
@@ -1112,6 +1112,9 @@
     if (isar_feature_aa64_pan(id)) {
         valid |= PSTATE_PAN;
     }
+    if (isar_feature_aa64_uao(id)) {
+        valid |= PSTATE_UAO;
+    }
 
     return valid;
 }