Add device/generic/arm64 to the remove-project list

If we don't it clashes with our own arm64/BoardConfig.mk file.
Change-Id: I449c06f3667020edddf42272f177886a95d23705
Signed-off-by: Lee Jones <lee.jones@linaro.org>

anbox.xml

@@ -10,6 +10,7 @@
     <remove-project name="platform/hardware/libhardware_legacy" />
     <remove-project name="platform/system/core" />
     <remove-project name="platform/system/netd" />
+    <remove-project name="device/generic/arm64" />
     <remove-project name="device/generic/x86" />
     <remove-project name="device/generic/x86_64" />
     <remove-project name="device/generic/goldfish" />