init.rc: enable ledtrig-transient support for vibrator

This change makes the init process to always attempts to enable
transient trigger for vibrator. This allows the exported properties to
change the ownership later at the on boot stage.

Test: device vibrates with the driver supports ledtrig-transient

Change-Id: If5eb7b7feaefe803f2ead634fbe4fc7b48da84ea
Signed-off-by: David Lin <dtwlin@google.com>
diff --git a/rootdir/init.rc b/rootdir/init.rc
index c025d13..d338767 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -244,6 +244,10 @@
     # set RLIMIT_NICE to allow priorities from 19 to -20
     setrlimit 13 40 40
 
+    # This allows the ledtrig-transient properties to be created here so
+    # that they can be chown'd to system:system later on boot
+    write /sys/class/leds/vibrator/trigger "transient"
+
 # Healthd can trigger a full boot from charger mode by signaling this
 # property when the power button is held.
 on property:sys.boot_from_charger_mode=1
@@ -557,6 +561,11 @@
     chown system system /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
     chmod 0660 /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
 
+    chown system system /sys/class/leds/vibrator/trigger
+    chown system system /sys/class/leds/vibrator/activate
+    chown system system /sys/class/leds/vibrator/brightness
+    chown system system /sys/class/leds/vibrator/duration
+    chown system system /sys/class/leds/vibrator/state
     chown system system /sys/class/timed_output/vibrator/enable
     chown system system /sys/class/leds/keyboard-backlight/brightness
     chown system system /sys/class/leds/lcd-backlight/brightness