fastboot: support for overriding format fs-type and size

This changes allows overriding the fs-type and size that
are normally returned by the booloader.

This is in preparation for supporting other FSes.

Change-Id: I8d141a0d4d14df9fe84d3b131484e9696fcd8870
Signed-off-by: JP Abgrall <jpa@google.com>
diff --git a/fastboot/fs.h b/fastboot/fs.h
index 65b9555..8388629 100644
--- a/fastboot/fs.h
+++ b/fastboot/fs.h
@@ -5,7 +5,7 @@
 
 struct fs_generator;
 
-const struct fs_generator* fs_get_generator(const char* name);
+const struct fs_generator* fs_get_generator(const char *fs_type);
 int fs_generator_generate(const struct fs_generator* gen, int tmpFileNo, long long partSize);
 
 #endif