add aarch64 support for x86_64 bcc if specified

Change-Id: I372296d928e4ce0fa411f23b727c1bf16286004f
Signed-off-by: jgu21 <jinghui.gu@intel.com>
diff --git a/libbcc-targets.mk b/libbcc-targets.mk
index a95a9aa..7bb2384 100644
--- a/libbcc-targets.mk
+++ b/libbcc-targets.mk
@@ -37,7 +37,7 @@
 
 ifeq ($(BUILD_ARM_FOR_X86),true)
 LOCAL_CFLAGS_x86 += -DPROVIDE_ARM_CODEGEN -DFORCE_BUILD_ARM
-LOCAL_CFLAGS_x86_64 += -DPROVIDE_ARM_CODEGEN -DFORCE_BUILD_ARM
+LOCAL_CFLAGS_x86_64 += -DPROVIDE_ARM_CODEGEN -DFORCE_BUILD_ARM -DPROVIDE_ARM64_CODEGEN
 endif