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/sama5d3xek_spiflash_defconfig b/configs/sama5d3xek_spiflash_defconfig
index 48103f0..37f603d 100644
--- a/configs/sama5d3xek_spiflash_defconfig
+++ b/configs/sama5d3xek_spiflash_defconfig
@@ -57,6 +57,9 @@
 CONFIG_DM_MMC=y
 CONFIG_GENERIC_ATMEL_MCI=y
 CONFIG_MTD_NOR_FLASH=y
+CONFIG_FLASH_CFI_DRIVER=y
+CONFIG_SYS_FLASH_PROTECTION=y
+CONFIG_SYS_FLASH_CFI=y
 CONFIG_NAND=y
 CONFIG_NAND_ATMEL=y
 CONFIG_DM_SPI_FLASH=y