ARM: dts: msm: Add iommu faults property in CNSS node for kona

Add iommu faults property for CNSS node which is needed when getting
WLAN firmware dump in kona.

CRs-Fixed: 2442316
Change-Id: I914dc18bf1c88bb268b61651ec25931a4f5b39fe
Signed-off-by: Yuanyuan Liu <yuanliu@codeaurora.org>