mainboard/emulation/qemu-q35: Do not compile memmap into SMM

This file contains functions related to PCIe and SMM, and so it's
needed by bootblock and ramstage, and possibly romstage. It's not needed
by SMM, and in a follow-up, the SMI handler will define `smm_region`,
causing a function redefinition error.

As this file isn't needed in SMM, and the SMI handler's function
will work for this board too, as it works for all silicon (it returns
values populated during ramstage, by board/silicon implementations
of the function), drop this compilation unit from SMM.

Change-Id: I0195e7d42b0669d675879fb4d2596aa4607095b9
Signed-off-by: Benjamin Doron <benjamin.doron@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/88995
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/emulation/qemu-q35/Makefile.mk

@@ -21,5 +21,4 @@ all-y += ../qemu-i440fx/bootmode.c
 ramstage-$(CONFIG_CHROMEOS) += chromeos.c
 
 smm-y += ../qemu-i440fx/rom_media.c
-smm-y += memmap.c
 smm-y += smihandler.c