FASTRPC: Update library search path

Updated library search path for 64-bit and minimized error logging.

Change-Id: If3393aec6bf7026747c65a462341403f8edc4434
Acked-by: Krishnaiah Tadakamalla <ktadakam@qti.qualcomm.com>
Signed-off-by: Mohammed Nayeem Ur Rahman <mohara@codeaurora.org>
Signed-off-by: Mayank Chopra <mak.chopra@codeaurora.org>