cmd: unzip: 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>

cmd/Kconfig

@@ -539,6 +539,7 @@ config CMD_LZMADEC
 
 config CMD_UNZIP
 	bool "unzip"
+	default n if ARCH_SUNXI
 	default y if CMD_BOOTI
 	help
 	  Uncompress a zip-compressed memory region.