msm: mdss: SPI panel not support ULP mode on MSM8909W

SPI panel not support ULP mode in doze mode.

Change-Id: I7b998ba3b8f1dd87ec8ae432d77a295b509ea539
Signed-off-by: Wenjun Zhang <wjzhan@codeaurora.org>
Signed-off-by: Abhijith Desai <desaia@codeaurora.org>