net: stmmac: dwmac-meson8b: remove unneeded semicolon

A semicolon is not needed after a switch statement.

Signed-off-by: Tom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/20201101140720.2280013-1-trix@redhat.com


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