cmd: loads: Disable by default on sunXi

The sunXi arm64 build has overflown, leading to the main U-boot binary
overwriting the environment when flashing the new image, or even worse,
overwriting itself when we're calling saveenv.

Disable this command that is not critical until we can adress the issue
properly.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 824a47e..49dd3f9 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -755,6 +755,7 @@
 
 config CMD_LOADS
 	bool "loads"
+	default n if ARCH_SUNXI
 	default y
 	help
 	  Load an S-Record file over serial line