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/drivers/mtd/Kconfig b/drivers/mtd/Kconfig
index d8e2dec..04ae456 100644
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -77,6 +77,15 @@
 	help
 	  This must be kept in sync with the table in include/flash.h
 
+config FLASH_SHOW_PROGRESS
+	int "Print out a countdown durinng writes"
+	depends on FLASH_CFI_DRIVER
+	default 45
+	help
+	  If set to a non-zero value, print out countdown digits and dots.
+	  Recommended value: 45 (9..1) for 80 column displays, 15 (3..1) for 40
+	  column displays.
+
 config CFI_FLASH
 	bool "Enable Driver Model for CFI Flash driver"
 	depends on DM_MTD