intel: Use CF9 reset (part 1)

Add SOUTHBRIDGE_INTEL_COMMON_RESET for all Intel platforms that used to
perform a "system reset" in their hard_reset() implementation. Replace
all duplicate CF9 reset implementations for these platforms.

Change-Id: I8e359b0c4d5a1060edd0940d24c2f78dfed8a590
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/28862
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/southbridge/intel/common/Kconfig

@@ -1,5 +1,10 @@
 config SOUTHBRIDGE_INTEL_COMMON
 	def_bool n
+	select SOUTHBRIDGE_INTEL_COMMON_RESET
+
+config SOUTHBRIDGE_INTEL_COMMON_RESET
+	bool
+	select HAVE_CF9_RESET
 
 config SOUTHBRIDGE_INTEL_COMMON_GPIO
 	def_bool n