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/P5040DS_SPIFLASH_defconfig b/configs/P5040DS_SPIFLASH_defconfig
index 8dd5404..1c34959 100644
--- a/configs/P5040DS_SPIFLASH_defconfig
+++ b/configs/P5040DS_SPIFLASH_defconfig
@@ -28,6 +28,9 @@
 CONFIG_FSL_CAAM=y
 CONFIG_FSL_ESDHC=y
 CONFIG_MTD_NOR_FLASH=y
+CONFIG_FLASH_CFI_DRIVER=y
+CONFIG_SYS_FLASH_USE_BUFFER_WRITE=y
+CONFIG_SYS_FLASH_CFI=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_SPANSION=y
 CONFIG_PHYLIB=y