soc/intel/braswell/Kconfig: select RELOCATABLE_RAMSTAGE

Without RELOCATABLE_RAMSTAGE selected, S3 resume will hang under
Linux and Windows.  All other Intel SoCs have this selected by
default, so this change simply corrects an omission on Braswell.

TEST: boot Linux on google/cyan with and without RELOCATABLE_RAMSTAGE
selected; observe that S3 resume fails without and succeeds with.

Change-Id: I9071d9b4e3e3a156281d95fae059947c4c26f744
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/20819
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/braswell/Kconfig

@@ -23,6 +23,7 @@ config CPU_SPECIFIC_OPTIONS
 	select HAVE_HARD_RESET
 	select NO_FIXED_XIP_ROM_SIZE
 	select RELOCATABLE_MODULES
+	select RELOCATABLE_RAMSTAGE
 	select PARALLEL_MP
 	select PCIEXP_ASPM
 	select PCIEXP_CLK_PM