Convert CONFIG_LZMA to Kconfig

This converts the following to Kconfig:
   CONFIG_LZMA

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/Kconfig b/arch/Kconfig
index bad0352..beec00a 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -72,6 +72,7 @@
 	imply CMD_HASH
 	imply CMD_IO
 	imply CMD_IOTRACE
+	imply LZMA
 
 config SH
 	bool "SuperH architecture"