soc/intel/cannonlake: Do not use XIP_ROM_SIZE

XIP_ROM_SIZE Kconfig option isn't used on Cannon Lake and
family. Thus, this change selects NO_FIXED_XIP_ROM_SIZE to indicate to
build system so that romstage can be placed in less rigid manner.

BUG=b:129802811

Change-Id: I5f3786396246c89b1039ba1b6b332a32e6a0345d
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32258
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/soc/intel/cannonlake/Kconfig

@@ -70,6 +70,7 @@ config CPU_SPECIFIC_OPTIONS
 	select INTEL_GMA_ADD_VBT if RUN_FSP_GOP
 	select IOAPIC
 	select MRC_SETTINGS_PROTECT
+	select NO_FIXED_XIP_ROM_SIZE
 	select PARALLEL_MP
 	select PARALLEL_MP_AP_WORK
 	select PLATFORM_USES_FSP2_0