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/qemu-riscv64_defconfig b/configs/qemu-riscv64_defconfig
index d5eae95..7430fa0 100644
--- a/configs/qemu-riscv64_defconfig
+++ b/configs/qemu-riscv64_defconfig
@@ -20,4 +20,5 @@
 # CONFIG_CMD_MII is not set
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_DM_MTD=y
+CONFIG_FLASH_SHOW_PROGRESS=0
 CONFIG_SYS_MAX_FLASH_BANKS=2