Patch merged into coreboot/master: lib: put romstage_handoff implementation in own compilation unit

the following patch was just integrated into master:
commit afe8aeed81003e941d91e8733ea7459a58d1a4d7
Author: Aaron Durbin 
Date:   Tue Nov 29 21:37:42 2016 -0600

lib: put romstage_handoff implementation in own compilation unit

Instead of putting all the functions inline just put the
    current implementation into a C file. That way all the implementation
    innards are not exposed.

Lastly, fix up the fallout of compilation units not including the
    headers they actually use.

Change-Id: I01fd25d158c0d5016405b73a4d4df3721c281b04
    Signed-off-by: Aaron Durbin 
    Reviewed-on: https://review.coreboot.org/17648
    Tested-by: build bot (Jenkins)
    Reviewed-by: Kyösti Mälkki 
    Reviewed-by: Furquan Shaikh

See https://review.coreboot.org/17648 for details.

-gerrit