cmd: Add unlz4 command

This command is a new command called "unlz4" that decompresses from memory
into memory.
Used with the CONFIG_CMD_UNLZ4 optionenabled.

Signed-off-by: Yusuke Ashiduka <ashiduka@fujitsu.com>
[trini: Use %zd / %zX not %ld / %lX in printf]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index faa133d..0e25762 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -770,6 +770,13 @@
 	  Support decompressing an LZMA (Lempel-Ziv-Markov chain algorithm)
 	  image from memory.
 
+config CMD_UNLZ4
+	bool "unlz4"
+	default y if CMD_BOOTI
+	select LZ4
+	help
+	  Support decompressing an LZ4 image from memory region.
+
 config CMD_UNZIP
 	bool "unzip"
 	default y if CMD_BOOTI