Convert CONFIG_CMD_LZMADEC to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_LZMADEC

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/Kconfig b/arch/Kconfig
index beec00a..84da4e7 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -73,6 +73,7 @@
 	imply CMD_IO
 	imply CMD_IOTRACE
 	imply LZMA
+	imply CMD_LZMADEC
 
 config SH
 	bool "SuperH architecture"