dmaengine: gpi: Log the assigned GPII per SE during probe

This change Enhances IPC logs to add SE instance to know which
GPII is attached to which SE device, this helps in debug. Also,
removed unnecessary read of iommu-dma property.

Change-Id: I6a5a9312d80abab2addc0c63642429a787f9065c
Signed-off-by: Mukesh Kumar Savaliya <msavaliy@codeaurora.org>