Convert CONFIG_FLASH_SHOW_PROGRESS to Kconfig

This converts the following to Kconfig:
   CONFIG_FLASH_SHOW_PROGRESS

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/at91sam9263ek_norflash_defconfig b/configs/at91sam9263ek_norflash_defconfig
index 794cf0e..d82cd214 100644
--- a/configs/at91sam9263ek_norflash_defconfig
+++ b/configs/at91sam9263ek_norflash_defconfig
@@ -51,6 +51,7 @@
 CONFIG_MTD=y
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_FLASH_CFI_DRIVER=y
+CONFIG_FLASH_SHOW_PROGRESS=0
 CONFIG_SYS_FLASH_CFI=y
 CONFIG_SYS_MAX_FLASH_SECT=256
 CONFIG_MTD_RAW_NAND=y