fix(eclass/cros-kernel/x86_64_defconfig) add ACPI support

This adds ACPI support to the kernel, which Azure needs in order to
properly boot.  Also added is the needed disk drivers, and other hyper-v
drivers.

Bonus is that the shutdown problem is fixed for kvm images, they no
longer hang forever.
Merge pull request #16 from gregkh/azure-kernel

fix(eclass/cros-kernel/x86_64_defconfig) add ACPI support