Refactor libfastboot

This change creates a nice and clean API for issuing
fastboot commands without using the fastboot tool itself.

Test: fastboot tool itself (now using libfastboot2)
on sailfish, walleye, and other devices.
Test: flash bootloader bootloader.img
Test: flash radio radio.img
Test: -w update img.zip
Test: Manually getvar and reboot commands.

Bug: 111126621
Change-Id: I0022536b204ce0c5ad8329367fd522fa3c57877d
diff --git a/fastboot/bootimg_utils.cpp b/fastboot/bootimg_utils.cpp
index c9814e4..1152007 100644
--- a/fastboot/bootimg_utils.cpp
+++ b/fastboot/bootimg_utils.cpp
@@ -28,7 +28,7 @@
 
 #include "bootimg_utils.h"
 
-#include "fastboot.h"
+#include "util.h"
 
 #include <stdio.h>
 #include <stdlib.h>