net: ti: icssg-prueth: add missing deps

Add missing dependency on NET_SWITCHDEV.

Fixes: abd5576b ("net: ti: icssg-prueth: Add support for ICSSG switch firmware")
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Guillaume La Roque <glaroque@baylibre.com>
Reviewed-by: MD Danish Anwar <danishanwar@ti.com>
Link: https://patch.msgid.link/20240708-net-deps-v2-1-b22fb74da2a3@baylibre.com


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