adsprpc: Do not print fastrpc channel opened messages

Adsprpc channel opened messages are flooding kernel log,
so do not print channel openend messages.

Change-Id: I862766d0ab9352d5718d9540a19f943050f772e5
Acked-by: Chenna Kesava Raju <chennak@qti.qualcomm.com>
Signed-off-by: Tharun Kumar Merugu <mtharu@codeaurora.org>