arch/x86/assembly_entry: Remove cpu_info

Since cpu_info() is no longer required to use threads, we no longer need
to initialize it in romstage or earlier. This code was also incomplete
since it didn't initialize the %gs segment.

BUG=b:179699789
TEST=Boot guybrush to OS

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I615b718e9f035ca68ecca9f57d7f4121db0c83b0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58203
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>

src/arch/x86/assembly_entry.S

@@ -1,6 +1,5 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-#include <cpu/x86/cpu_info.S.inc>
 #include <rules.h>
 
 /*
@@ -36,8 +35,6 @@ _start:
 	/* reset stack pointer to CAR/EARLYRAM stack */
 	mov	$_STACK_TOP, %esp
 
-	push_cpu_info
-
 	/* clear .bss section as it is not shared */
 	cld
 	xor	%eax, %eax