drivers: qcom: cmd-db: Dump resource data via debugfs

Add support to dump command DB data via debugfs. This allows drivers to
lookup data resource information without a resource ID.

Change-Id: I04e7466f76ceea00d762752e0c0123edfabe0f64
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>