net: dsa: microchip: drop unneeded MODULE_ALIAS

The ID table already has respective entry and MODULE_DEVICE_TABLE and
creates proper alias for SPI driver.  Having another MODULE_ALIAS causes
the alias to be duplicated.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20240414154929.127045-1-krzk@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>