Revert "Remove hotplug from simpleramfs"

This reverts commit 2555c64793f32065e0a165e68ed28d56c11f3283.

Causes problems for spacecast. See discussion in b/34131115.

Change-Id: Ib760b8c7b2ba6294d918c7cb830004c27e7a5ad0
1 file changed