binman: Select compression bintools in cbfs_util class

Select the lz4 and lzma_alone bintools in cbfs_util class to centralize
the supported compression algorithm evaluation inside the class and over
multiple classes.

Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/cbfs_util_test.py b/tools/binman/cbfs_util_test.py
index f86b295..e0f792f 100755
--- a/tools/binman/cbfs_util_test.py
+++ b/tools/binman/cbfs_util_test.py
@@ -19,7 +19,6 @@
 from binman import bintool
 from binman import cbfs_util
 from binman.cbfs_util import CbfsWriter
-from binman import comp_util
 from binman import elf
 from patman import test_util
 from patman import tools
@@ -50,7 +49,8 @@
         cls.cbfstool = bintool.Bintool.create('cbfstool')
         cls.have_cbfstool = cls.cbfstool.is_present()
 
-        cls.have_lz4 = comp_util.HAVE_LZ4
+        lz4 = bintool.Bintool.create('lz4')
+        cls.have_lz4 = lz4.is_present()
 
     @classmethod
     def tearDownClass(cls):