realtek: drop extraneous ')' in 02_network

realtek: drop extraneous ')' in 02_network

The extraneous closing parenthesis inside the case matching breaks
syntax of the network initialization script 02_network.

/bin/board_detect: /etc/board.d/02_network:
    line 40: syntax error: unexpected newline (expecting ")")

Remove this character so board init is functional again.

Fixes: c8ea1aa970bf ("realtek: add support for HPE 1920-24G-PoE-370w")
Signed-off-by: Sander Vanheule <sander@svanheule.net>
(cherry picked from commit a3391d871d3f14f5de2081e23eda08986abc2b9b)