arch/x86: Make RELOCATABLE_RAMSTAGE the default

No need to provide an option to try disable this.

Also remove explicit ´select RELOCATABLE_MODULES'
lines from platform Kconfigs.

Change-Id: I5fb169f90331ce37b4113378405323ec856d6fee
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/26815
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/soc/intel/denverton_ns/Kconfig

@@ -40,7 +40,6 @@ config CPU_SPECIFIC_OPTIONS
 	select HAVE_SMI_HANDLER
 	select SMM_TSEG
 	select CACHE_MRC_SETTINGS
-	select RELOCATABLE_RAMSTAGE     # Build fails if this is not selected
 	select PARALLEL_MP
 	select PCR_COMMON_IOSF_1_0
 	select SMP