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

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

Change-Id: I5d03bc2c46deac9dd9e9b002b1ce1751cc2cfc3d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>