arch/x86/Makefile.mk: Remove obsolete romcc reference

No assembly.inc file is being generated by romcc anymore.

The -I. was only used in a single place that can use the common -Isrc
instead.

Change-Id: I57a3a6e1c2cf7cf30fb0cd94cc8455f715050490
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83563
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/arch/x86/Makefile.mk

@@ -58,9 +58,6 @@ define x86_stage
 # $1 stage name
 # $2 oformat
 
-# The '.' include path is needed for the generated assembly.inc file.
-$(1)-S-ccopts += -I.
-
 $$(objcbfs)/$(1).debug: $$$$($(1)-libs) $$$$($(1)-objs)
 	@printf "    LINK       $$(subst $$(obj)/,,$$(@))\n"
 	$$(LD_$(1)) $$(LDFLAGS_$(1)) -o $$@ -L$$(obj) $$(COMPILER_RT_FLAGS_$(1)) --whole-archive --start-group $$(filter-out %.ld,$$($(1)-objs)) $$($(1)-libs) --no-whole-archive $$(COMPILER_RT_$(1)) --end-group -T $(call src-to-obj,$(1),$(CONFIG_MEMLAYOUT_LD_FILE)) --oformat $(2)

src/northbridge/intel/sandybridge/mrc_wrapper.S

@@ -32,6 +32,6 @@ mrc_wrapper:
 	 * function do_putchar to print to console.
 	 */
 
-#include <src/cpu/x86/64bit/prot2long.inc>
+#include <cpu/x86/64bit/prot2long.inc>
 
 prot2lm_wrapper do_putchar