soc/intel: indicate to build system that XIP_ROM_SIZE isn't used

The XIP_ROM_SIZE Kconfig variable isn't used for these chipsets.
Therefore, indicate as such so that romstage can be placed in
cbfs less rigidly.

Change-Id: If5cae10b90e05029df56c282e8adf37fa0102955
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/14626
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/apollolake/Kconfig

@@ -23,6 +23,7 @@ config CPU_SPECIFIC_OPTIONS
 	select HAVE_INTEL_FIRMWARE
 	select MMCONF_SUPPORT
 	select MMCONF_SUPPORT_DEFAULT
+	select NO_FIXED_XIP_ROM_SIZE
 	select PARALLEL_MP
 	select PCIEXP_ASPM
 	select PCIEXP_COMMON_CLOCK

src/soc/intel/baytrail/Kconfig

@@ -18,6 +18,7 @@ config CPU_SPECIFIC_OPTIONS
 	select HAVE_HARD_RESET
 	select MMCONF_SUPPORT
 	select MMCONF_SUPPORT_DEFAULT
+	select NO_FIXED_XIP_ROM_SIZE
 	select RELOCATABLE_MODULES
 	select RELOCATABLE_RAMSTAGE
 	select PARALLEL_MP

src/soc/intel/braswell/Kconfig

@@ -21,6 +21,7 @@ config CPU_SPECIFIC_OPTIONS
 	select HAVE_HARD_RESET
 	select MMCONF_SUPPORT
 	select MMCONF_SUPPORT_DEFAULT
+	select NO_FIXED_XIP_ROM_SIZE
 	select RELOCATABLE_MODULES
 	select PARALLEL_MP
 	select PCIEXP_ASPM

src/soc/intel/skylake/Kconfig

@@ -24,6 +24,7 @@ config CPU_SPECIFIC_OPTIONS
 	select IOAPIC
 	select MMCONF_SUPPORT
 	select MMCONF_SUPPORT_DEFAULT
+	select NO_FIXED_XIP_ROM_SIZE
 	select PARALLEL_MP
 	select PCIEXP_ASPM
 	select PCIEXP_COMMON_CLOCK