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

This reverts commit d55dad8b.

Upstream commit af199a1a9cb0 ("net: dsa: microchip: set the correct
number of ports") seems to have been applied twice on top of the 5.4
branch. This revert the second instance of said commit.

Signed-off-by: Sasha Levin <sashal@kernel.org>