intel/sch: Move HAVE_HARD_RESET to southbridge

No in-tree board using that chipset has it not selected, so move
selection from boards to southbridge.

Change-Id: I521deecf58e5d5de303f1ef2f5ff7e965294de18
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/665
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)

src/mainboard/iwave/iWRainbowG6/Kconfig

@@ -18,7 +18,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select BOARD_ROMSIZE_KB_1024
 	select USE_DCACHE_RAM
 	select GFXUMA
-	select HAVE_HARD_RESET
 
 config MAINBOARD_DIR
 	string

src/southbridge/intel/sch/Kconfig

@@ -20,6 +20,7 @@
 config SOUTHBRIDGE_INTEL_SCH
 	bool
 	select HAVE_USBDEBUG
+	select HAVE_HARD_RESET
 
 if SOUTHBRIDGE_INTEL_SCH