sh: shuffle the elfcorehdr handling over to the crash dump code.

The elfcorehdr parsing was just tossed in setup.c, but nothing outside of
the crash dump code/vmcore bits require it, so we just move it out of the
way, as per ppc.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --cc arch/sh/kernel/crash_dump.c
Simple merge

diff --cc arch/sh/kernel/setup.c
Simple merge