Add adb enable-verity

Note that it is *easy* to break your phone with this feature. It is
not a bug that reenabling verity after changing one byte of the system
partition stops the device booting.

(cherry-pick of 7c442e1700e6312727283db402dec6f666f1b55a.)

Bug: 18529433
Change-Id: I632e91281884471a362960f1ba30312d2669b8ff
diff --git a/adb/adb.h b/adb/adb.h
index 044760e..35d8a4d 100644
--- a/adb/adb.h
+++ b/adb/adb.h
@@ -328,8 +328,10 @@
 
 #if !ADB_HOST
 void framebuffer_service(int fd, void *cookie);
+// Allow enable-verity to write to system and vendor block devices
+int make_system_and_vendor_block_devices_writable();
 void remount_service(int fd, void *cookie);
-void disable_verity_service(int fd, void* cookie);
+void set_verity_enabled_state_service(int fd, void* cookie);
 #endif
 
 /* packet allocator */