soc/intel/quark: Add FSP 2.0 romstage support

Add the pieces necessary to successfully build and run romstage using
the FSP 2.0 build.  Because romstage is using postcar, add the postcar
pieces so that romstage can attempt to load postcar.

TEST=Build and run on Galileo Gen2

Change-Id: I66b3437e3c7840223535f6ab643599c9e4924968
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/15866
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/mainboard/intel/galileo/Kconfig

@@ -54,7 +54,7 @@ config USE_FSP1_1
 config USE_FSP2_0
 	bool
 	default n
-	select BOOTBLOCK_CONSOLE
 	select PLATFORM_USES_FSP2_0
+	select POSTCAR_STAGE
 
 endif # BOARD_INTEL_QUARK