ARM: dts: msm: disable UFS probe for SDM855

UFS controller and device communication isn't stable enough at this moment
hence disable it to avoid any other system instability due to it.

Change-Id: I88bcbda720305eb1b22ad57df7f89762300268d6
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>