Install qemu-linux-user-cross-arm also for aarch64

Install qemu-linux-user-cross-arm also for aarch64

After refactoring made in qemu-accel it's preferable to have symmetric
things for arm and aarch64 everywhere if possible. Before this change
binaries /usr/bin/qemu-arm64 and /usr/bin/qemu-arm64-binfmt where packed to
qemu-accel-aarch64 package, thus qemu-linux-user-cross-arm was not
needed. But after refactoring we changed the behavior of
qemu-accel-aarch64 and it also requires qemu-linux-user-cross-arm now.

Change-Id: I8f39fbb665da9131cba1ed343ccd970d07458584
Signed-off-by: Ilya Palachev <i.palachev@samsung.com>