fs/erofs: add lz4 decompression support

Support EROFS lz4 compressed files.

Signed-off-by: Huang Jianan <jnhuang95@gmail.com>
diff --git a/fs/erofs/Kconfig b/fs/erofs/Kconfig
index f4b2d51..ee4e777 100644
--- a/fs/erofs/Kconfig
+++ b/fs/erofs/Kconfig
@@ -10,3 +10,12 @@
 	  improves storage density, keeps relatively higher compression
 	  ratios, which is more useful to achieve high performance for
 	  embedded devices with limited memory.
+
+config FS_EROFS_ZIP
+	bool "EROFS Data Compression Support"
+	depends on FS_EROFS
+	select LZ4
+	default y
+	help
+	  Enable fixed-sized output compression for EROFS.
+	  If you don't want to enable compression feature, say N.