intel/i82801cx: 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: Ifba0b65d81af60774f368d151e935ae1cc768336
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/662
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)

src/mainboard/intel/xe7501devkit/Kconfig

@@ -9,7 +9,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select SOUTHBRIDGE_INTEL_I82801CX
 	select SUPERIO_SMSC_LPC47B272
 	select ROMCC
-	select HAVE_HARD_RESET
 	select BOARD_HAS_HARD_RESET
 	select HAVE_PIRQ_TABLE
 	select HAVE_MP_TABLE

src/southbridge/intel/i82801cx/Kconfig

@@ -1,2 +1,4 @@
 config SOUTHBRIDGE_INTEL_I82801CX
 	bool
+	select HAVE_HARD_RESET
+