Make it easier to disable EROFS compression.

Currently the only way to do this is to enable deduplication.

Bug: N/A
Test: BOARD_EROFS_COMPRESSOR := none
Change-Id: I7f8b99fbcefe7bbc15dfab7062b321aa3e2cf1ca
diff --git a/tools/releasetools/build_image.py b/tools/releasetools/build_image.py
index 9567fdc..6d7895e 100755
--- a/tools/releasetools/build_image.py
+++ b/tools/releasetools/build_image.py
@@ -328,7 +328,7 @@
       compressor = prop_dict["erofs_default_compressor"]
     if "erofs_compressor" in prop_dict:
       compressor = prop_dict["erofs_compressor"]
-    if compressor:
+    if compressor and compressor != "none":
       build_command.extend(["-z", compressor])
 
     compress_hints = None