ARM: dts: msm: Disable ATOS feature for smmu for sm6150

Due to HW errata on the eCATS functionality, doing TBU halt
while data traffic is in progress can cause a system hang.
Disabling ATOS/eCATS is the only way of working around this
errata.

Change-Id: Ie668d7d2a0b7473048a5070bb87d4065d35e1c25
Signed-off-by: Vijayanand Jitta <vjitta@codeaurora.org>