soc/intel/apollolake: enable postcar console

Unconditionally turn on postcar console for apollolake.

BUG=chrome-os-partner:57513

Change-Id: I3d956be4a5834a4721767d34216eebeabef3e315
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/16620
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Andrey Petrov <andrey.petrov@intel.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/soc/intel/apollolake/Kconfig

@@ -40,6 +40,7 @@ config CPU_SPECIFIC_OPTIONS
 	select PCIEXP_COMMON_CLOCK
 	select PCIEXP_CLK_PM
 	select PCIEXP_L1_SUB_STATE
+	select POSTCAR_CONSOLE
 	select POSTCAR_STAGE
 	select REG_SCRIPT
 	select RELOCATABLE_RAMSTAGE	# Build fails if this is not selected