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/gose_defconfig b/configs/gose_defconfig
index b0dfa90..01aa817 100644
--- a/configs/gose_defconfig
+++ b/configs/gose_defconfig
@@ -19,3 +19,4 @@
 CONFIG_SH_SDHI=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_BAR=y
+CONFIG_SPI_FLASH_SPANSION=y