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/malta64_defconfig b/configs/malta64_defconfig
index b635c65..03de161 100644
--- a/configs/malta64_defconfig
+++ b/configs/malta64_defconfig
@@ -37,6 +37,7 @@
 CONFIG_SYS_ATA_IDE0_OFFSET=0x01f0
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_FLASH_CFI_DRIVER=y
+CONFIG_FLASH_SHOW_PROGRESS=0
 CONFIG_SYS_FLASH_USE_BUFFER_WRITE=y
 CONFIG_SYS_FLASH_CFI=y
 CONFIG_SYS_MAX_FLASH_SECT=128