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/P1022DS_36BIT_NAND_defconfig b/configs/P1022DS_36BIT_NAND_defconfig
index 817e29b..a57ab4a 100644
--- a/configs/P1022DS_36BIT_NAND_defconfig
+++ b/configs/P1022DS_36BIT_NAND_defconfig
@@ -5,6 +5,7 @@
 CONFIG_TPL=y
 CONFIG_SYS_EXTRA_OPTIONS="36BIT,NAND"
 CONFIG_SPI_FLASH=y
+CONFIG_SPI_FLASH_SPANSION=y
 CONFIG_NETDEVICES=y
 CONFIG_E1000=y
 CONFIG_SYS_NS16550=y