mako: set display brightness on boot

Change-Id: Ib94e8007860a5f1598cb923d5d0bf995ac2423e9
Signed-off-by: Iliyan Malchev <malchev@google.com>
diff --git a/init.mako.rc b/init.mako.rc
index 5a9439d..af4e933 100644
--- a/init.mako.rc
+++ b/init.mako.rc
@@ -191,6 +191,7 @@
     write /proc/sys/net/ipv6/conf/rmnet_sdio6/accept_ra 2
     write /proc/sys/net/ipv6/conf/rmnet_sdio7/accept_ra 2
 
+    write /sys/class/leds/lcd-backlight/brightness 255
 
 # import cne init file
 on post-fs