Move bzip.h to payload_generator.

The in-memory bzip compression and decompression functions are only
used during payload generation and testing. This patch moves those
functions to the payload_generator/ directory and keeps the streamed
version (bzip_extent_writter.h) in the update_engine daemon.

Bug: None
Test: FEATURES=test emerge-link update_engine; `mm` on Brillo.

Change-Id: I78227fdac15df6461b23debb41c72207b22fb5db
diff --git a/Android.mk b/Android.mk
index c3b0fda..56e2514 100644
--- a/Android.mk
+++ b/Android.mk
@@ -127,7 +127,6 @@
     action_processor.cc \
     boot_control_android.cc \
     boot_control_stub.cc \
-    bzip.cc \
     bzip_extent_writer.cc \
     certificate_checker.cc \
     chrome_browser_proxy_resolver.cc \
@@ -272,6 +271,7 @@
     payload_generator/annotated_operation.cc \
     payload_generator/blob_file_writer.cc \
     payload_generator/block_mapping.cc \
+    payload_generator/bzip.cc \
     payload_generator/cycle_breaker.cc \
     payload_generator/delta_diff_generator.cc \
     payload_generator/delta_diff_utils.cc \