net: qrtr: haven: Add bounds check on tx path

Add bounds check on values read from shared memory in the tx path. In
cases where the VM is misbehaving, the qrtr haven transport should
exit and print a warning when bogus values may cause out of bounds to
be read.

Change-Id: Ic1177ced6f41de66459970eff4537d82de4f614e
Signed-off-by: Sarannya S <quic_sarannya@quicinc.com>