net: qrtr: fifo: Add bounds check in rx path

Validate the values read from shared memory in the receive path.
In the case where a VM is misbehaving, the qrtr transport should
return immediately and print a warning.

Change-Id: I088f6cc77433dfcd099e5c117b9ca6408c40f09e
Signed-off-by: Sarannya S <quic_sarannya@quicinc.com>