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/M5275EVB_defconfig b/configs/M5275EVB_defconfig
index e7e799b..01961e5 100644
--- a/configs/M5275EVB_defconfig
+++ b/configs/M5275EVB_defconfig
@@ -41,6 +41,7 @@
 CONFIG_SYS_I2C_SPEED=80000
 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=11
 CONFIG_MCFFEC=y