Convert CONFIG_LZMA to Kconfig

This converts the following to Kconfig:
   CONFIG_LZMA

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/lib/Kconfig b/lib/Kconfig
index db09151..09670f0 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -148,6 +148,14 @@
 	  frame format currently (2015) implemented in the Linux kernel
 	  (generated by 'lz4 -l'). The two formats are incompatible.
 
+config LZMA
+	bool "Enable LZMA decompression support"
+	help
+	  This enables support for LZMA (Lempel-Ziv-Markov chain algorithm),
+	  a dictionary compression algorithm that provides a high compression
+	  ratio and fairly fast decompression speed. See also
+	  CONFIG_CMD_LZMADEC which provides a decode command.
+
 config LZO
 	bool
 endmenu