ART: add exynos-m2 to a53 #835769 & #843419 erratum exception list

Exynos-M2 is custom-designed 64-bit ARM CPU and does not need this A53
erratum handling.

Change-Id: I2a72a0cb84d6cffe45a87ac23ff3164806bb7a7a
Signed-off-by: Junmo Park <junmoz.park@samsung.com>
diff --git a/runtime/arch/arm64/instruction_set_features_arm64.cc b/runtime/arch/arm64/instruction_set_features_arm64.cc
index 01bd177..e5f6f11 100644
--- a/runtime/arch/arm64/instruction_set_features_arm64.cc
+++ b/runtime/arch/arm64/instruction_set_features_arm64.cc
@@ -53,6 +53,7 @@
     static const char* arm64_known_variants[] = {
         "cortex-a35",
         "exynos-m1",
+        "exynos-m2",
         "denver64",
         "kryo"
     };