ARM: msm: dts: Disable U1U2 low power modes for QCS610

Disable U1U2 low power modes for QCS610 which is required for
avoiding flickering issues with UVC over isochronous endpoint.

Change-Id: Iceb4328141714553574b5729c73775d917688469
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>