Merge "microdroid: Replace empty_kernel with :empty_file" am: 2d2ef9623a am: c7cdcd8a5d

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/2543210

Change-Id: Ic24f39cb6a45af982dd7adc893fd0009e21f4f64
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>