net: dsa: microchip: set the correct number of ports

commit af199a1a upstream.

The number of ports is incorrectly set to the maximum available for a DSA
switch. Even if the extra ports are not used, this causes some functions
to be called later, like port_disable() and port_stp_state_set(). If the
driver doesn't check the port index, it will end up modifying unknown
registers.

Fixes: b987e98e ("dsa: add DSA switch driver for Microchip KSZ9477")
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
[PG: no ksz8795.c before v5.4-rc1~131^2~329^2 ; drop that chunk.]
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>