[PATCH v2] Add make feature support for SoCFPGA Handoff

[Sune Brian]

> OK. I was hoping that we could just automate as part of the regular
> build process seeing for example $(BOARD)/foo.xml and invoking the
> script to re-create foo.c and so forth, but that doesn't seem to be the
> case. So, no Makefile logic. We should then instead start on some
> content for doc/board/socfpga/ and document this tool there. Thanks!

Ok what you expected on the automation flow.
I can give it a try. But the build flow for Altera project side
is that the compiled handoff is in the form of a folder.
only foo_bar is defined by user other naming on C5
should be fixed.

hps_isw_handoff/foo_bar/

|-- alt_types.h
|-- foo_bar.hiof
|-- emif.xml
|-- hps.xml
|-- id
|-- sdram_io.h
|-- sequencer.c
|-- sequencer.h
|-- sequencer_auto.h
|-- sequencer_auto_ac_init.c
|-- sequencer_auto_inst_init.c
|-- sequencer_defines.h
|-- system.h
|-- tclrpt.c
`-- tclrpt.h

Documentation is not an issue.

Brian