southbridge/amd: update for amdfwtool size on command line

amdfwtool was getting the ROM size as a #define when it was built.
It has been updated to pass it in as a command line parameter, so
now it can be built just once for abuild as a shared tool.

Update the calls to amdfwtool to pass the ROM size.

All platforms using amdfwtool had the output verified using
a binary compare.

This reverts commit 0529236ed2
(Makefile.inc: Don't share amdfwtool between platforms)

Change-Id: I188b34e08249f2d00bd48957ced750b21f1ec348
Signed-off-by: Martin Roth <martinroth@chromium.org>
Reviewed-on: https://review.coreboot.org/17327
Tested-by: build bot (Jenkins)
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

src/southbridge/amd/agesa/hudson/Makefile.inc

@@ -62,6 +62,7 @@ $(obj)/amdfw.rom:	$(call strip_quotes, $(CONFIG_HUDSON_XHCI_FWM_FILE)) \
 		$(OPT_HUDSON_XHCI_FWM_FILE) \
 		$(OPT_HUDSON_IMC_FWM_FILE) \
 		$(OPT_HUDSON_GEC_FWM_FILE) \
+		--flashsize $(CONFIG_ROM_SIZE) \
 		--output	$@
 
 cbfs-files-y += apu/amdfw

src/southbridge/amd/pi/hudson/Makefile.inc

@@ -291,6 +291,7 @@ $(obj)/amdfw.rom:	$(call strip_quotes, $(CONFIG_HUDSON_XHCI_FWM_FILE)) \
 		$(OPT_2TRUSTLETKEY_FILE) \
 		$(OPT_2SMUFIRMWARE2_FILE) \
 		$(OPT_2SMUSCS_FILE) \
+		--flashsize $(CONFIG_ROM_SIZE) \
 		--output	$@
 
 cbfs-files-y += apu/amdfw