x86: qemu: Switch to standard boot

Drop use of the distro boot script and use standard boot instead.

Moving to a text-based environment would be desirable also, but requires
additional work.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/configs/qemu-x86_defconfig b/configs/qemu-x86_defconfig
index a7c37b8..56788cd 100644
--- a/configs/qemu-x86_defconfig
+++ b/configs/qemu-x86_defconfig
@@ -9,7 +9,7 @@
 CONFIG_GENERATE_PIRQ_TABLE=y
 CONFIG_GENERATE_MP_TABLE=y
 CONFIG_FIT=y
-CONFIG_DISTRO_DEFAULTS=y
+CONFIG_BOOTSTD_DEFAULTS=y
 CONFIG_BOOTSTAGE=y
 CONFIG_BOOTSTAGE_REPORT=y
 CONFIG_SHOW_BOOT_PROGRESS=y