Add empty /lib/modules directory to mount kernel modules.

Change-Id: I8378a9052fe0c1ba9f8249131cc07833e1172748
diff --git a/linux-aarch64/images/rootfs.ext4 b/linux-aarch64/images/rootfs.ext4
index e4930bc..6c832ed 100644
--- a/linux-aarch64/images/rootfs.ext4
+++ b/linux-aarch64/images/rootfs.ext4
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