sb/intel/i82801gx: Only include SPI code with SPI boot devices

On devices lacking SPI boot devices there is a hefty timeout
penalty on probing for flash chips and this code would not
be useful anyway.

Change-Id: I0bec11372ef54c1e1e611b81f7013932257f4ca6
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36868
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/southbridge/intel/i82801gx/Kconfig

@@ -23,7 +23,7 @@ config SOUTHBRIDGE_INTEL_I82801GX
 	select COMMON_FADT
 	select SOUTHBRIDGE_INTEL_COMMON_GPIO
 	select SOUTHBRIDGE_INTEL_COMMON_SMBUS
-	select SOUTHBRIDGE_INTEL_COMMON_SPI
+	select SOUTHBRIDGE_INTEL_COMMON_SPI if BOOT_DEVICE_SPI_FLASH
 	select SOUTHBRIDGE_INTEL_COMMON_PMCLIB
 	select SOUTHBRIDGE_INTEL_COMMON_PMBASE
 	select HAVE_INTEL_CHIPSET_LOCKDOWN

src/southbridge/intel/i82801gx/lpc.c

@@ -616,7 +616,8 @@ static void lpc_final(struct device *dev)
 	if (!CONFIG(INTEL_CHIPSET_LOCKDOWN))
 		return;
 
-	spi_finalize_ops();
+	if (CONFIG(BOOT_DEVICE_SPI_FLASH))
+		spi_finalize_ops();
 
 	/* Lock SPIBAR */
 	SPIBAR16(0) = SPIBAR16(0) | (1 << 15);