diag: Validate proper mdlog session for a PD

The patch updates the mdlog session to be checked
based on the active user PD logging session.

CRs-Fixed: 2045080
Change-Id: Ieac3301545970aac91efa5a6f66c44530ff251f3
Signed-off-by: Manoj Prabhu B <bmanoj@codeaurora.org>