msm: adsprpc: Remove remote mappings after PD is up

Currently before staticPD on QDSP is up, remote mappings are
being removed. Instead, remove the mappings after staticPD is up.

Change-Id: I10a37b4c840dbd830f7b8897aabbf8681329b74c
Acked-by: Vishnu Karthik D <vikarthi@qti.qualcomm.com>
Signed-off-by: Tharun Kumar Merugu <mtharu@codeaurora.org>