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/vct_premium_small_defconfig b/configs/vct_premium_small_defconfig
index 93bb305..a8eba61 100644
--- a/configs/vct_premium_small_defconfig
+++ b/configs/vct_premium_small_defconfig
@@ -22,4 +22,6 @@
 CONFIG_ENV_IS_IN_FLASH=y
 # CONFIG_NET is not set
 CONFIG_MTD_NOR_FLASH=y
+CONFIG_FLASH_CFI_DRIVER=y
+CONFIG_SYS_FLASH_CFI=y
 CONFIG_SYS_NS16550=y