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>

coreboot: don't take address of pointer when reading oct record

Signed-off-by: Reto Achermann <reto.achermann@inf.ethz.ch>

coreboot: prepare new cpudriver on armv8 and use of hwid_t

Signed-off-by: Reto Achermann <reto.achermann@inf.ethz.ch>

coreboot: reorganize into arch directory, starting with ARMv8 support

Signed-off-by: Reto Achermann <reto.achermann@inf.ethz.ch>