msm: qcn: Reserve 8 bufferes in RW queue for RX

The current QCN core driver support four concurrent clients,
and there can be only two CRQ's that can be raised per client
from device.
Reserve 8 bufferes for data reception from device to host.

Change-Id: Iac72b5dd51988ffd1139bf55ecb9799bded77710
Signed-off-by: Amandeep Singh <amansing@codeaurora.org>