mhi: dev: satellite: enhance command processing log messages

Enhance some log messages in the command processing path and
expose length and IOVA address for IOMMU command processed.

CRs-Fixed: 2514029
Change-Id: I681085bfc527919834a5137106d44b5ca2bf2d51
Acked-by: Bhaumik Vasav Bhatt <bbhatt@qti.qualcomm.com>
Signed-off-by: Sujeev Dias <sdias@codeaurora.org>