lm3554: removing compiler warnings from lm3554

lm3554: removing compiler warnings from lm3554

BZ:26628

Removing compiler warnings from lm3554

Change-Id: I49be41994e400f71cc4de91fc35749dee8a20047
Signed-off-by: Antti Laakso <antti.laakso@intel.com>
Reviewed-on: http://android.intel.com:8080/39997
Reviewed-by: Toivonen, Tuukka <tuukka.toivonen@intel.com>
Reviewed-by: Kruger, Jozef <jozef.kruger@intel.com>
Reviewed-by: Koski, Anttu <anttu.koski@intel.com>
Tested-by: Koski, Anttu <anttu.koski@intel.com>
Reviewed-by: Shevchenko, Andriy <andriy.shevchenko@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>