sandbox: Drop special link order treatment of start.o and sdl.o

On hardware architectures, we need to treat start.o (generated from
start.S) very special due to the constraints of being a program running
on hardware in an unknown state. These objects are treated a little
different than the rest by the linker and linker scripts on various
architectures.

Sandbox is different, and doesn't need to do that. In fact, it can lead
to hard to diagnose problems because of just how subtly different the
treatment is. For example, the comment about LTO in include/event.h
introduced with commit 87a5d1b5d012 ("event: Add basic support for
events") was only a sandbox issue because of the event in start.c and
in turn linking start.o isn't treated the same way as an archive with
all its sections considered.

Correct all of this by removing the "head-" lines for cpu.o and sdl.o
from arch/sandbox/Makefile (and unused cmd_cc_sdl.o lines) and change
arch/sandbox/cpu/Makefile to treating them both with "obj-" and not
"extra-".

Reviewed-by: Simon Glass <[email protected]>
Signed-off-by: Tom Rini <[email protected]>

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