sandbox: Disable CONFIG_DISTRO_DEFAULTS

This is not used for sandbox, so drop it. Enable the things that it
controls to avoid dstrastic changes in the config settings for
sandbox builds.

The end result is that these are enabled:

   BOOTMETH_DISTRO
   BOOTSTD_DEFAULTS

and these are disabled:

   USE_BOOTCOMMAND
   BOOTCOMMAND (was "run distro_bootcmd")
   DISTRO_DEFAULTS

Note that the tools-only build has already disabled DISTRO_DEFAULTS
and BOOTSTD_FULL

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/Kconfig b/arch/Kconfig
index 4f5b751..6fa17b2 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -210,6 +210,9 @@
 	imply BINMAN
 	imply CMD_MBR
 	imply CMD_MMC
+	imply BOOTSTD_DEFAULTS if BOOTSTD_FULL && CMDLINE
+	imply BOOTMETH_DISTRO if BOOTSTD_FULL && CMDLINE
+	imply CMD_SYSBOOT if BOOTSTD_FULL
 
 config SH
 	bool "SuperH architecture"