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_platinumavc_defconfig b/configs/vct_platinumavc_defconfig
index 974d47b..3783bec 100644
--- a/configs/vct_platinumavc_defconfig
+++ b/configs/vct_platinumavc_defconfig
@@ -13,5 +13,7 @@
 # CONFIG_ISO_PARTITION is not set
 CONFIG_ENV_IS_IN_FLASH=y
 CONFIG_MTD_NOR_FLASH=y
+CONFIG_FLASH_CFI_DRIVER=y
+CONFIG_SYS_FLASH_CFI=y
 CONFIG_SYS_NS16550=y
 # CONFIG_REGEX is not set