serial: msm_geni_serial: Reduce nos tty port registration

UART geni driver supports max 1 console port only whereas it uses
HSUART defined macro. This will just create more tty port as part
of registration which is not required. Hence change console port
registration to 1 port.

Change-Id: I1535f7ea92fe3ddf861cc24c82bd0d4c54408d73
Signed-off-by: Mukesh Kumar Savaliya <msavaliy@codeaurora.org>