usbdebug: Fix boards without EARLY_CBMEM_INIT

The main usbdebug file lib/usbdebug.c was removed from romstage
build with commit f8bf5a10 but the chipset-specific parts were not,
leading to unresolved symbol errors for AMD platforms.

Add a silent Kconfig variable USBDEBUG_IN_ROMSTAGE for convenient
use of this feature.

Change-Id: I0cd3fccf2612cf08497aa5c3750c89bf43ff69be
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3983
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>

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

@@ -12,7 +12,7 @@ ramstage-y += sd.c
 
 ramstage-$(CONFIG_GENERATE_ACPI_TABLES) += fadt.c
 ramstage-y += reset.c
-romstage-$(CONFIG_USBDEBUG) += enable_usbdebug.c
+romstage-$(CONFIG_USBDEBUG_IN_ROMSTAGE) += enable_usbdebug.c
 ramstage-$(CONFIG_USBDEBUG) += enable_usbdebug.c
 romstage-y += early_setup.c
 

src/southbridge/amd/cimx/sb700/Makefile.inc

@@ -30,5 +30,5 @@ ramstage-y += reset.c
 ramstage-y   += smbus.c
 ramstage-y   += lpc.c
 
-romstage-$(CONFIG_USBDEBUG) += ../../sb700/enable_usbdebug.c
+romstage-$(CONFIG_USBDEBUG_IN_ROMSTAGE) += ../../sb700/enable_usbdebug.c
 ramstage-$(CONFIG_USBDEBUG) += ../../sb700/enable_usbdebug.c

src/southbridge/amd/cimx/sb800/Makefile.inc

@@ -34,7 +34,7 @@ ramstage-$(CONFIG_SB800_IMC_FAN_CONTROL) += fan.c
 ramstage-$(CONFIG_HAVE_ACPI_RESUME) += spi.c
 ramstage-$(CONFIG_GENERATE_ACPI_TABLES) += fadt.c
 
-romstage-$(CONFIG_USBDEBUG) += ../../sb800/enable_usbdebug.c
+romstage-$(CONFIG_USBDEBUG_IN_ROMSTAGE) += ../../sb800/enable_usbdebug.c
 ramstage-$(CONFIG_USBDEBUG) += ../../sb800/enable_usbdebug.c
 
 ramstage-y   += smbus.c

src/southbridge/amd/sb600/Makefile.inc

@@ -8,5 +8,5 @@ ramstage-y += hda.c
 ramstage-y += ac97.c
 ramstage-y += pci.c
 ramstage-y += reset.c
-romstage-$(CONFIG_USBDEBUG) += enable_usbdebug.c
+romstage-$(CONFIG_USBDEBUG_IN_ROMSTAGE) += enable_usbdebug.c
 ramstage-$(CONFIG_USBDEBUG) += enable_usbdebug.c

src/southbridge/amd/sb700/Makefile.inc

@@ -10,7 +10,7 @@ ramstage-y += pci.c
 ramstage-$(CONFIG_GENERATE_ACPI_TABLES) += fadt.c
 romstage-y += reset.c
 ramstage-y += reset.c
-romstage-$(CONFIG_USBDEBUG) += enable_usbdebug.c
+romstage-$(CONFIG_USBDEBUG_IN_ROMSTAGE) += enable_usbdebug.c
 ramstage-$(CONFIG_USBDEBUG) += enable_usbdebug.c
 
 romstage-y += early_setup.c

src/southbridge/amd/sb800/Makefile.inc

@@ -9,5 +9,5 @@ ramstage-y += pci.c
 ramstage-y += pcie.c
 ramstage-$(CONFIG_GENERATE_ACPI_TABLES) += fadt.c
 ramstage-y += reset.c
-romstage-$(CONFIG_USBDEBUG) += enable_usbdebug.c
+romstage-$(CONFIG_USBDEBUG_IN_ROMSTAGE) += enable_usbdebug.c
 ramstage-$(CONFIG_USBDEBUG) += enable_usbdebug.c