Convert CONFIG_SHOW_BOOT_PROGRESS to Kconfig

This converts the following to Kconfig:
   CONFIG_SHOW_BOOT_PROGRESS

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/efi-x86_payload64_defconfig b/configs/efi-x86_payload64_defconfig
index c4071ec..ecd8d3e 100644
--- a/configs/efi-x86_payload64_defconfig
+++ b/configs/efi-x86_payload64_defconfig
@@ -4,6 +4,7 @@
 CONFIG_TARGET_EFI_PAYLOAD=y
 CONFIG_FIT=y
 CONFIG_FIT_SIGNATURE=y
+CONFIG_SHOW_BOOT_PROGRESS=y
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="root=/dev/sdb3 init=/sbin/init rootwait ro"
 CONFIG_PRE_CONSOLE_BUFFER=y