soc/amd/stoneyridge: Add northbridge support

Copy northbridge files from northbridge/amd/pi/00670F00
to soc/amd/stoneyridge and soc/amd/common.

Changes:
- update chip_ops and device_ops
- remove multi-node support
- clean up Kconfig and Makefile

Change-Id: Ie86b4d744900f23502068517ece5bcea6c128993
Signed-off-by: Marc Jones <marcj303@gmail.com>
Reviewed-on: https://review.coreboot.org/19724
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

src/vendorcode/amd/pi/Makefile.inc

@@ -61,11 +61,11 @@ ifeq ($(CONFIG_CPU_AMD_PI_00630F01),y)
 AGESA_INC += -I$(AGESA_ROOT)/Proc/IDS
 endif
 
-AGESA_INC += -I$(src)/northbridge/amd/pi
-
 ifeq ($(CONFIG_SOC_AMD_STONEYRIDGE_FP4)$(CONFIG_SOC_AMD_STONEYRIDGE_FT4),y)
 AGESA_INC += -I$(src)/soc/amd/stoneyridge/include
+AGESA_INC += -I$(src)/soc/amd/common
 else
+AGESA_INC += -I$(src)/northbridge/amd/pi
 AGESA_INC += -I$(src)/southbridge/amd/pi/hudson
 endif