Patch merged into coreboot/master: cpu/x86/16bit: rename _start -> _start16bit

the following patch was just integrated into master:
commit f8468d43e01c8110bdcb5956106c904b41d1ca09
Author: Aaron Durbin 
Date:   Wed Mar 2 14:47:37 2016 -0600

cpu/x86/16bit: rename _start -> _start16bit

In order to avoid collisions with other _start symbols while
    grepping and future ones be explicit about which _start this
    one is: the 16-bit one only used by the reset vector in the
    bootblock.

Change-Id: I6d7580596c0e6602a87fb158633ce9d45910cec2
    Signed-off-by: Aaron Durbin 
    Reviewed-on: https://review.coreboot.org/13880
    Reviewed-by: Stefan Reinauer 
    Tested-by: build bot (Jenkins)

See https://review.coreboot.org/13880 for details.

-gerrit