Remove invoke_frame_identify, replaced with frame_identify().

This commit fully removes the Frame_Identify invocation and replaces the
calls with frame_identify().
Additionally, because the KCB is special, this commit introduces a new
invocation kcb_identify() which translates the lvaddr in the KCB
capability into the pysical address of the kernel control block.

Signed-off-by: Simon Gerber <simon.gerber@inf.ethz.ch>

Initial import of block device refactoring.

- Refactors existing AHCI code to use device queue interface.
- Adds harness test for disks.
- Adds some minor improvements for scalebench harness.
- Disable vtd due to some bug with the identity mapping on babybel machines.

Signed-off-by: Gerd Zellweger <mail@gerdzellweger.com>

Conflicts:
usr/acpi/acpi_main.c