msm: smd_pkt: Extend read operation to receive data larger than SMD FIFO

The SMD_PKT driver read operation restricts the maximum data size to
the corresponding SMD channel size. When the remote side of the SMD
channel wants to send more data than the SMD channel size, it leads
to the data stall in that SMD channel. So update the read operation
to receive data larger than the SMD channel size.

Change-Id: I1701bac24a9268eb440ca4e4373af4fadc9cef73
CRs-Fixed: 313591
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>