sf: Move SPI flash drivers to defconfig
There are already Kconfig options for SPI flash drivers, but we
have not moved them from config.h to defconfig files. This commit
does this in a batch.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/configs/nitrogen6s_defconfig b/configs/nitrogen6s_defconfig
index c21ba2a..9b44758 100644
--- a/configs/nitrogen6s_defconfig
+++ b/configs/nitrogen6s_defconfig
@@ -6,3 +6,4 @@
# CONFIG_CMD_FLASH is not set
CONFIG_CMD_GPIO=y
CONFIG_SPI_FLASH=y
+CONFIG_SPI_FLASH_SST=y