Add support to fastboot_driver for sending sparse images with CRC check

The default argument will prevent anything from breaking

Test: Build on glinux
Change-Id: Ib427ab210476db1ec1c69c0a3238d0653e98b79a
diff --git a/fastboot/fastboot_driver.h b/fastboot/fastboot_driver.h
index dd199c0..fae9dc4 100644
--- a/fastboot/fastboot_driver.h
+++ b/fastboot/fastboot_driver.h
@@ -74,7 +74,7 @@
     // This will be removed after fastboot is modified to use a vector
     RetCode Download(const char* buf, uint32_t size, std::string* response = nullptr,
                      std::vector<std::string>* info = nullptr);
-    RetCode Download(sparse_file* s, std::string* response = nullptr,
+    RetCode Download(sparse_file* s, bool use_crc = false, std::string* response = nullptr,
                      std::vector<std::string>* info = nullptr);
     RetCode Erase(const std::string& part, std::string* response = nullptr,
                   std::vector<std::string>* info = nullptr);