Rename bison to bison_bin

I'm adding a prebuilt_build_tool module for bison so that it can be used
by genrules. That module should have the "bison" name as it's usable
during the build, while this is only usable when moved into the correct
directory (so that its data files may be found).

Bug: 128690776
Test: treehugger
Change-Id: I00893172ba9ef1362944e3cde2197cd2fb80142d
diff --git a/Android.bp b/Android.bp
index 19965bf..7f46cbe 100644
--- a/Android.bp
+++ b/Android.bp
@@ -50,7 +50,11 @@
 //##########################################
 
 cc_binary_host {
-    name: "bison",
+    // This isn't usable as-is from the installed directory, so name it
+    // something else so it doesn't match with the prebuilt_build_tool and the
+    // stem will rename it back to bison on the filesystem.
+    name: "bison_bin",
+    stem: "bison",
     defaults: [
         "bison_defaults",
         "bison_linux_defaults",