ARM: dts: msm: Add timer default trigger for PMI632 RGB LEDs

Add timer default trigger for RGB LEDs to export delay_on/off parameters
for light HAL to set them accordingly.

Change-Id: I8dfc4aac1309d6e2621a4fcae53dfbdf61501da8
Signed-off-by: Fenglin Wu <fenglinw@codeaurora.org>