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/comtrend_ct5361_ram_defconfig b/configs/comtrend_ct5361_ram_defconfig
index 594bdde..f3f09e5 100644
--- a/configs/comtrend_ct5361_ram_defconfig
+++ b/configs/comtrend_ct5361_ram_defconfig
@@ -51,6 +51,7 @@
 CONFIG_LED_GPIO=y
 CONFIG_DM_MTD=y
 CONFIG_MTD_NOR_FLASH=y
+CONFIG_FLASH_SHOW_PROGRESS=0
 CONFIG_CFI_FLASH=y
 CONFIG_SYS_FLASH_EMPTY_INFO=y
 CONFIG_SYS_FLASH_PROTECTION=y