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/j721s2_hs_evm_a72_defconfig b/configs/j721s2_hs_evm_a72_defconfig
index 3e0ec40..9fc9073 100644
--- a/configs/j721s2_hs_evm_a72_defconfig
+++ b/configs/j721s2_hs_evm_a72_defconfig
@@ -140,6 +140,7 @@
 CONFIG_MTD=y
 CONFIG_DM_MTD=y
 CONFIG_MTD_NOR_FLASH=y
+CONFIG_FLASH_SHOW_PROGRESS=0
 CONFIG_CFI_FLASH=y
 CONFIG_SYS_FLASH_USE_BUFFER_WRITE=y
 CONFIG_FLASH_CFI_MTD=y