soc/amd/stoneyridge: Enable SPI writes

- Change soc/amd/stoneyridge/Kconfig to set BOOT_DEVICE_SUPPORTS_WRITES

BUG=b:65485690
TEST=Build & boot kahlee.

Change-Id: I595a27ac27daa42c2499de1a343bc30be9a89fa6
Signed-off-by: John E. Kabat Jr <john.kabat@scarletltd.com>
Signed-off-by: Marc Jones <marcj303@gmail.com>
Reviewed-on: https://review.coreboot.org/22636
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/src/soc/amd/common/Makefile.inc b/src/soc/amd/common/Makefile.inc
index aa27512..22eb0d6 100644
--- a/src/soc/amd/common/Makefile.inc
+++ b/src/soc/amd/common/Makefile.inc
@@ -16,7 +16,6 @@
 ramstage-y += def_callouts.c
 ramstage-y += heapmanager.c
 ramstage-$(CONFIG_SPI_FLASH) += spi.c
-
 subdirs-$(CONFIG_SOC_AMD_COMMON_BLOCK) += block
 
 endif
diff --git a/src/soc/amd/stoneyridge/Kconfig b/src/soc/amd/stoneyridge/Kconfig
index fce3857..dd95b85 100644
--- a/src/soc/amd/stoneyridge/Kconfig
+++ b/src/soc/amd/stoneyridge/Kconfig
@@ -50,6 +50,7 @@
 	select SOC_AMD_COMMON_BLOCK_CAR
 	select C_ENVIRONMENT_BOOTBLOCK
 	select BOOTBLOCK_CONSOLE
+	select BOOT_DEVICE_SUPPORTS_WRITES if BOOT_DEVICE_SPI_FLASH
 	select RELOCATABLE_MODULES
 	select PARALLEL_MP
 	select PARALLEL_MP_AP_WORK