Convert CONFIG_FLASH_CFI_DRIVER et al to Kconfig

This converts the following to Kconfig:
   CONFIG_FLASH_CFI_DRIVER
   CONFIG_SYS_FLASH_USE_BUFFER_WRITE
   CONFIG_FLASH_CFI_MTD
   CONFIG_SYS_FLASH_PROTECTION
   CONFIG_SYS_FLASH_CFI

Signed-off-by: Adam Ford <aford173@gmail.com>
[trini: Re-migrate]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/caddy2_defconfig b/configs/caddy2_defconfig
index 4367ed0..5fec4f8 100644
--- a/configs/caddy2_defconfig
+++ b/configs/caddy2_defconfig
@@ -18,6 +18,8 @@
 CONFIG_CMD_DATE=y
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y
+CONFIG_FLASH_CFI_DRIVER=y
+CONFIG_SYS_FLASH_CFI=y
 CONFIG_E1000=y
 CONFIG_BAUDRATE=9600
 CONFIG_SYS_NS16550=y