coreos-kernel: enable LPSS support for Intel SoC platforms

This is required to access the onboard eMMC device.

Fixes https://github.com/coreos/bugs/issues/209
Merge pull request #1008 from marineam/lpss

coreos-kernel: enable LPSS support for Intel SoC platforms
app-emulation/qemu: add qemu to improve streamOptimized vmdk support for VMware OVF