Emit the build fingerprint for the kernel log monitor

BUG: 122378432
Test: Local boot + examined TreeHugger logs on presubmit
Change-Id: I5e1ead8748d4dcc4a4b3599afbedc26d2864941c
(cherry picked from commit 0e96ea55c00f68079963eed88a28881c6b9410f5)
diff --git a/shared/config/init.vsoc.rc b/shared/config/init.vsoc.rc
index ddf0e26..f3e6826 100644
--- a/shared/config/init.vsoc.rc
+++ b/shared/config/init.vsoc.rc
@@ -72,6 +72,8 @@
     start gce_fs_monitor
     start vport_trigger
 
+on late-fs
+    write /dev/kmsg "GUEST_BUILD_FINGERPRINT: ${ro.build.fingerprint}"
 
 on early-boot
     start vsoc_input_service