ARM: dts: msm: Enable backlight cooling device for TRINKET

Add display backlight cooling device for TRINKET. This cooling
device can be used for controlling the temperature due to
backlight display.

Change-Id: Ib09eb6583a6df30e1cdec3f53a5615ec6aa48eaf
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>