hammerhead: enable slimport detection after boot completion [DO NOT MERGE]

To prevent slimport error during boot up, wait until boot
completion before start slimport detection.

Bug: 11518558
Change-Id: I4d3e8bf27cebc5e79d566400d768fadc2873e9b5
diff --git a/init.hammerhead.rc b/init.hammerhead.rc
index d75ac66..8f55dd2 100644
--- a/init.hammerhead.rc
+++ b/init.hammerhead.rc
@@ -284,6 +284,9 @@
     write /sys/module/pm_8x60/modes/cpu3/retention/idle_enabled 1
     start mpdecision
 
+    # enable slimport detection
+    write /sys/module/slimport/parameters/enable_irq 1
+
 service rmt_storage /system/bin/rmt_storage
     class core
     user root