soc/amd/common: Make fch_spi_config_modes static

It is currently only used in this translation unit.

Signed-off-by: Mathew King <mathewk@chromium.org>
Change-Id: Ib779a38306fb45320f3e4eb71f63630023d59906
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51535
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/common/block/include/amdblocks/spi.h

@@ -88,14 +88,6 @@ struct spi_config {
  */
 void fch_spi_early_init(void);
 
-/*
- * Configure SPI speed and read mode.
- *
- * This function expects SoC to include soc_amd_common_config in chip SoC config and uses
- * settings from mainboard devicetree to configure speed and read mode.
- */
-void fch_spi_config_modes(void);
-
 /* Set the SPI base address variable */
 void spi_set_base(void *base);
 

src/soc/amd/common/block/spi/fch_spi.c

@@ -49,7 +49,7 @@ static void fch_spi_config_em100_modes(void)
 	fch_spi_set_spi100(SPI_SPEED_16M, SPI_SPEED_16M, SPI_SPEED_16M, SPI_SPEED_16M);
 }
 
-void fch_spi_config_modes(void)
+static void fch_spi_config_modes(void)
 {
 	if (CONFIG(EM100))
 		fch_spi_config_em100_modes();