fix rpath and revert qemu-img
CrosvmBackendInstance: add prepare-lend-mthp
prebuilts: sync with Droid-VM/DroidVM-Prebuilts
ui: add HugePageActivity
backend: add QemuBackend
TextInputRowWidget: add onFocusLost and onEditorAction
ConsoleStream: fix resource leak
SimpleConsoleStream: set to readable
BackendBase: add multiple VM backend supports
CrosvmBackendInstance: move basic setup to VMBackendInstance
VMConfig: add use_uefi config item
VMEditBasicTab: add backend choose
