ARM: dts: msm: remove camera's led for msm8909w

As there is no led for camera in msm8909w and led_flash crashes
system sometimes, so delete the led_flash0.

Change-Id: I21a4ebb02243b32a37a887c108c07680e237be8f
Signed-off-by: Jiangjiang Shen <jiangjia@codeaurora.org>