Move away from mod.rs

It's discouraged in the style guide. No functional change at all
intended.

Test: Still builds
Change-Id: I1525d7a342db8ffb2c8afb0625220b350518f4c6
diff --git a/libs/hyp/src/hypervisor/mod.rs b/libs/hyp/src/hypervisor.rs
similarity index 100%
rename from libs/hyp/src/hypervisor/mod.rs
rename to libs/hyp/src/hypervisor.rs
diff --git a/pvmfw/avb/src/descriptor/mod.rs b/pvmfw/avb/src/descriptor.rs
similarity index 100%
rename from pvmfw/avb/src/descriptor/mod.rs
rename to pvmfw/avb/src/descriptor.rs
diff --git a/rialto/src/requests/mod.rs b/rialto/src/requests.rs
similarity index 100%
rename from rialto/src/requests/mod.rs
rename to rialto/src/requests.rs
diff --git a/vmbase/src/layout/mod.rs b/vmbase/src/layout.rs
similarity index 100%
rename from vmbase/src/layout/mod.rs
rename to vmbase/src/layout.rs
diff --git a/vmbase/src/memory/mod.rs b/vmbase/src/memory.rs
similarity index 100%
rename from vmbase/src/memory/mod.rs
rename to vmbase/src/memory.rs
diff --git a/vmbase/src/virtio/mod.rs b/vmbase/src/virtio.rs
similarity index 100%
rename from vmbase/src/virtio/mod.rs
rename to vmbase/src/virtio.rs