defconfig: msm8974: Enable qpnp LEDs and associated triggers

LEDs must be enabled in defconfig in order to initialize
properly.  The LED class and triggers must also be
enabled for proper functionality.

Change-Id: I825b8cf90b5cb6033f971903e665978e7e5ce12f
Signed-off-by: Amy Maloche <amaloche@codeaurora.org>