ARM: dts: msm: Allow pm_suspend in host mode for msm8996 Auto CDP

Add device tree flag to allow system suspend on automotive CDP
platforms with USB devices connected that do not support runtime
suspend.

Change-Id: Ia2c7cff130d811627ef7de24822b68506af37e01
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>