lib: kconfig: Add option to set BZIP2 compression method

There is no way to select BZIP2 compression method.
Add it under library/compression config where all other
compression related configs are present.
Signed-off-by: NAtish Patra <atish.patra@wdc.com>
Reviewed-by: NTom Rini <trini@konsulko.com>

lib/Kconfig

@@ -409,6 +409,11 @@ config GZIP
 	help
 	  This enables support for GZIP compression algorithm.
 
+config BZIP2
+	bool "Enable bzip2 decompression support"
+	help
+	  This enables support for BZIP2 compression algorithm.
+
 config ZLIB
 	bool
 	default y